How to make all pixels of a button in CSS and HTML work, not just when clicking on button text

I have a button that should direct me to a certain page, and when I click it, it works. However, it only works when I click the actual text inside the button, not anywhere on the button itself.

I was able to find some CSS online for making a button, and I just edited it a bit, changed the color, radius, margins, and some other attributes. Here is the current CSS:

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-css -->

.btn {
  display: inline-block;
  cursor: pointer;
  border-radius: 10px;
  overflow: hidden;
  background-color: black;
  font-size: 1.19rem;
  text-align: center;
  padding: 12px 24px;
  margin-left: 45vw;
  margin-right: 45vw;
  border: 3px solid black;
  outline: 3px solid black;
}

<!-- language: lang-html -->

<div class="btn">
  <a href="<insert-url-here>">Text Here</a>
</div>

<!-- end snippet -->

Before I changed the CSS a bit, I could click anywhere on the button to go to the URL. However, after just changing the color and margins, which I don't think would cause this problem, I have to click on the text to go the URL, or else the button does nothing.

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-css -->

.btn {
  display: inline-block;
  cursor: pointer;
  border-radius: 10px;
  overflow: hidden;
  background-color: black;
  font-size: 1.19rem;
  text-align: center;
  padding: 12px 24px;
  margin-left: 45vw;
  margin-right: 45vw;
  border: 3px solid black;
  outline: 3px solid black;
}

<!-- language: lang-html -->

<a href="<insert-url-here>" class="btn">Text Here</a>

<!-- end snippet -->

1. If you can use JS, just use a button

<button type='button' onclick="location.href='https://www.google.com'">
    Go to google
</button>

2. Use a form submit

<form action='https://www.google.com'>
    <button>Go to google</button>
</form>

3. Use an a by itself and style it accordingly

<a class='btn' href='https://www.google.com'>Go to google</a>

.btn {
    margin: 0 45vw;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    height: 2rem;
    width: max-content;
    font-size: 1.19rem;
    background: black;
    border: 6px solid black;
    border-radius: 10px;
}

Depending on how you're using it, you should also look into centering your element with margin: auto.

Lastly, the default button text color is black so if you use a button, you'll also want to either change the text color or change your black background, otherwise it will just look like a black box.