英文:
why are the images being pushed down
问题
在我的代码中，最后一行的前两张图片被推下去了，请帮我将这些图片推回到它们应该的位置。
PS：我正在使用Bootstrap 3.4.1
PPS：这不应该做任何事情，所以你不需要修复它
PPPS：我可以稍后修复移动和平板电脑尺寸的问题，所以不用担心
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Gallery</title>
<link rel="stylesheet" href="PH.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Hungry Photos</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">About <span class="sr-only">(current)</span></a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="jumbotron">
<h1>The Image Gallery</h1>
<p>A collection of selected pictures from multiple photographers</p>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1558981420-87aa9dad1c89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577988504339-4dc891bdabe9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577990174632-90bfb7da0119?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<!-- 继续添加图片的代码 -->
</div><!-- row collapse -->
</div><!-- container collapse -->
<script src="https://code.jquery.com/jquery-2.2.4.js" integrity="sha256-iT6Q9iMJYuQiMWNd9lDyBUStIq/8PuOW33aOqmvFpqI=" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
</body>
</html>
英文:
in my code, the first two images of the last row are being pushed down please help me push the images back up to where it is supposed to be
PS: I am using bootstrap 3.4.1
PPS: it shouldn't do anything so you don't have to fix that
PPPS: I can fix the mobile and tablet size problem later so don't worry about dat
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-css -->
.navbar-default {
background-color: #2c3e50 !important;
}
nav a {
color: white !important;
}
<!-- language: lang-html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Gallery</title>
<link rel="stylesheet" href="PH.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Hungry Photos</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">About <span class="sr-only">(current)</span></a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="jumbotron">
<h1>The image Gallery</h1>
<p>A collection of selected pictures from multiple photographers</p>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1558981420-87aa9dad1c89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577988504339-4dc891bdabe9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577990174632-90bfb7da0119?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577949098254-1ad7b1b526eb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577915378375-b18d2bd947c3?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577895752018-7eefa8a5a2dc?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577836660968-ef4cc3909bb2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577918285732-0ddce6230a88?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577907796119-7118da053fab?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div>
</div> <!-- row collapse -->
</div> <!-- container collapse -->
<script src="https://code.jquery.com/jquery-2.2.4.js" integrity="sha256-iT6Q9iMJYuQiMWNd9lDyBUStIq/8PuOW33aOqmvFpqI=" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
</body>
</html>
<!-- end snippet -->
it shouldn't do anything so don't try to fix that
答案1
得分: 2
只需删除你在col-lg-4之间添加的额外行，并将这个CSS添加到row类中，问题应该就能解决了。请检查一下。如果有任何更改，请告诉我。
.row {
display: flex;
flex-wrap: wrap;
}
英文:
Just remove the extra row which you have added in between of col-lg-4. and add this css of display: flex in a row class.
Please check. I hope it will solve your problem. If any changes please let me know.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-css -->
.navbar-default {
background-color: #2c3e50 !important;
}
nav a {
color: white !important;
}
.row{
display: flex;
flex-wrap: wrap;
}
<!-- language: lang-html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Gallery</title>
<link rel="stylesheet" href="PH.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Hungry Photos</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">About <span class="sr-only">(current)</span></a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="jumbotron">
<h1>The image Gallery</h1>
<p>A collection of selected pictures from multiple photographers</p>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1558981420-87aa9dad1c89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577988504339-4dc891bdabe9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577990174632-90bfb7da0119?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577949098254-1ad7b1b526eb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577915378375-b18d2bd947c3?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577895752018-7eefa8a5a2dc?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577836660968-ef4cc3909bb2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577918285732-0ddce6230a88?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577907796119-7118da053fab?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div> <!-- row collapse -->
</div> <!-- container collapse -->
<script src="https://code.jquery.com/jquery-2.2.4.js" integrity="sha256-iT6Q9iMJYuQiMWNd9lDyBUStIq/8PuOW33aOqmvFpqI=" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
</body>
</html>
<!-- end snippet -->
答案2
得分: 1
这是由于图像大小不同引起的。您需要在内容中添加相同大小（宽度 x 高度）的图像。或者您可以使用CSS设置高度。
英文:
It's happening because of different size of images. You have to add same size (width x height) images in you content. Or you can set height using css.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-css -->
.navbar-default {
background-color: #2c3e50 !important;
}
nav a {
color: white !important;
}
div.thumbnail a>img, div.thumbnail>img {
height: 235px;
-o-object-fit: cover;
object-fit: cover;
}
<!-- language: lang-html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Gallery</title>
<link rel="stylesheet" href="PH.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Hungry Photos</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">About <span class="sr-only">(current)</span></a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="jumbotron">
<h1>The image Gallery</h1>
<p>A collection of selected pictures from multiple photographers</p>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1558981420-87aa9dad1c89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577988504339-4dc891bdabe9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577990174632-90bfb7da0119?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577949098254-1ad7b1b526eb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577915378375-b18d2bd947c3?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577895752018-7eefa8a5a2dc?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577836660968-ef4cc3909bb2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577918285732-0ddce6230a88?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577907796119-7118da053fab?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div>
</div> <!-- row collapse -->
</div> <!-- container collapse -->
<script src="https://code.jquery.com/jquery-2.2.4.js" integrity="sha256-iT6Q9iMJYuQiMWNd9lDyBUStIq/8PuOW33aOqmvFpqI=" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
</body>
</html>
<!-- end snippet -->
答案3
得分: 0
你需要将每个col放在row中，以确保每个row中不超过12个col。这是bootstrap-grid结构的工作方式。
正如你在它们的官方文档中看到的，如果有12个
col完成，下一个应该移到下一个row中。
"只有列可以是行的直接子元素"
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-css -->
.navbar-default {
background-color: #2c3e50 !important;
}
nav a {
color: white !important;
}
<!-- language: lang-html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Gallery</title>
<link rel="stylesheet" href="PH.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Hungry Photos</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">About <span class="sr-only">(current)</span></a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="jumbotron">
<h1>The image Gallery</h1>
<p>A collection of selected pictures from multiple photographers</p>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1558981420-87aa9dad1c89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577988504339-4dc891bdabe9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577990174632-90bfb7da0119?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577949098254-1ad7b1b526eb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577915378375-b18d2bd947c3?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577895752018-7eefa8a5a2dc?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577836660968-ef4cc3909bb2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577918285732-0ddce6230a88?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577907796119-7118da053fab?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q
<details>
<summary>英文:</summary>
You need to wrap each `col` inside `row` so that there is no more then 12 `col` in a `row`. This is how the `bootstrap-grid` structure works.
> As you can see in their official
> [DOC](https://getbootstrap.com/docs/4.0/layout/grid/) that if `12
> cols` complete the next should go to next `row`.
**
> "only columns may be immediate children of rows"
**
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-css -->
.navbar-default {
background-color: #2c3e50 !important;
}
nav a {
color: white !important;
}
<!-- language: lang-html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Gallery</title>
<link rel="stylesheet" href="PH.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Hungry Photos</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">About <span class="sr-only">(current)</span></a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="jumbotron">
<h1>The image Gallery</h1>
<p>A collection of selected pictures from multiple photographers</p>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1558981420-87aa9dad1c89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577988504339-4dc891bdabe9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577990174632-90bfb7da0119?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577949098254-1ad7b1b526eb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577915378375-b18d2bd947c3?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577895752018-7eefa8a5a2dc?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577836660968-ef4cc3909bb2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577918285732-0ddce6230a88?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577907796119-7118da053fab?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div> <!-- row collapse -->
</div> <!-- container collapse -->
<script src="https://code.jquery.com/jquery-2.2.4.js" integrity="sha256-iT6Q9iMJYuQiMWNd9lDyBUStIq/8PuOW33aOqmvFpqI=" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
</body>
</html>
<!-- end snippet -->
For more detail https://stackoverflow.com/questions/22053195/bootstrap-rows-and-columns-do-i-need-to-use-row
</details>
# 答案4
**得分**: 0
> 移除最后一列中的`<div class="row">`... 如果您使用了Bootstrap3，则需要添加`display:flex; flex-wrap:wrap`；如果您使用了Bootstrap4，则需要链接Bootstrap4 CDN链接...
>
> 注意：此答案仅针对您的列，而不是整个页面。
```html
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-css -->
.navbar-default {
background-color: #2c3e50 !important;
}
nav a {
color: white !important;
}
<!-- language: lang-html -->
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Gallery</title>
<link rel="stylesheet" href="PH.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Hungry Photos</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">About <span class="sr-only">(current)</span></a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="jumbotron">
<h1>The image Gallery</h1>
<p>A collection of selected pictures from multiple photographers</p>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1558981420-87aa9dad1c89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577988504339-4dc891bdabe9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577990174632-90bfb7da0119?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577949098254-1ad7b1b526eb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577915378375-b18d2bd947c3?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577895752018-7eefa8a5a2dc?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577836660968-ef4cc3909bb2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577918285732-0ddce6230a88?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577907796119-7118da053fab?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div> <!-- row collapse -->
</div> <!-- container collapse -->
<script
<details>
<summary>英文:</summary>
> Remove`<div class="row">` in Last column... and if u used bootstrap3 u need to add `display:flex; flex-wrap:wrap`; and if u have used bootstrap 4, u need to Link Bootstrap4 CDN Link...
>
> Note :- This answer in only for, your column not for full page..
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-css -->
.navbar-default {
background-color: #2c3e50 !important;
}
nav a {
color: white !important;
}
<!-- language: lang-html -->
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Gallery</title>
<link rel="stylesheet" href="PH.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Hungry Photos</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">About <span class="sr-only">(current)</span></a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="jumbotron">
<h1>The image Gallery</h1>
<p>A collection of selected pictures from multiple photographers</p>
</div>
<div class="row">
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1558981420-87aa9dad1c89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577988504339-4dc891bdabe9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577990174632-90bfb7da0119?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577949098254-1ad7b1b526eb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577915378375-b18d2bd947c3?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577895752018-7eefa8a5a2dc?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577836660968-ef4cc3909bb2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577918285732-0ddce6230a88?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
<div class="col-lg-4">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1577907796119-7118da053fab?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="">
</div>
</div>
</div> <!-- row collapse -->
</div> <!-- container collapse -->
<script src="https://code.jquery.com/jquery-2.2.4.js" integrity="sha256-iT6Q9iMJYuQiMWNd9lDyBUStIq/8PuOW33aOqmvFpqI=" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
</body>
</html>
<!-- end snippet -->
</details>
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
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