Carousel will "jump" to a position when the arrow button is clicked

I found a carousel that i love its effect and want to use in my project.
However there is a problem that once you click on the arrow button, it will force the whole page to goto a certain position and play the next slide-show.(but this is not happened when opened inspector)
This is the only part that is weird. Could any expert help me to see whether can fix?

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

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

@keyframes tonext {
75% {
left: 0;
}
95% {
left: 100%;
}
98% {
left: 100%;
}
99% {
left: 0;
}
}
@keyframes tostart {
75% {
left: 0;
}
95% {
left: -300%;
}
98% {
left: -300%;
}
99% {
left: 0;
}
}
@keyframes snap {
96% {
scroll-snap-align: center;
}
97% {
scroll-snap-align: none;
}
99% {
scroll-snap-align: none;
}
100% {
scroll-snap-align: center;
}
}
body {
max-width: 37.5rem;
margin: 0 auto;
padding: 0 1.25rem;
font-family: 'Lato', sans-serif;
}
* {
box-sizing: border-box;
scrollbar-color: transparent transparent;
/* thumb and track color */
scrollbar-width: 0px;
}
*::-webkit-scrollbar {
width: 0;
}
*::-webkit-scrollbar-track {
background: transparent;
}
*::-webkit-scrollbar-thumb {
background: transparent;
border: none;
}
* {
-ms-overflow-style: none;
}
ol,
li {
list-style: none;
margin: 0;
padding: 0;
}
.carousel {
position: relative;
padding-top: 70%;
filter: drop-shadow(0 0 10px #0003);
perspective: 90px;
}
.carousel__viewport {
position: absolute;
top: 20px;
right: 0;
bottom: 20px;
left: 0;
display: flex;
overflow-x: scroll;
counter-reset: item;
scroll-behavior: smooth;
scroll-snap-type: x mandatory;
}
.carousel__slide {
position: relative;
flex: 0 0 100%;
width: 100%;
background-color: #f99;
counter-increment: item;
}
.carousel__slide:nth-child(even) {
background-color: #99f;
}
.carousel__slide:before {
content: counter(item);
position: absolute;
top: 80%;
left: 50%;
transform: translate3d(-50%, -40%, 70px);
color: #fff;
font-size: 2em;
}
.carousel__snapper {
position: absolute;
top: 0px;
left: 0;
width: 100%;
height: 100%;
scroll-snap-align: center;
}
@media (hover: hover) {
.carousel__snapper {
animation-name: tonext, snap;
animation-timing-function: ease;
animation-duration: 4s;
animation-iteration-count: infinite;
}
.carousel__slide:last-child .carousel__snapper {
animation-name: tostart, snap;
}
}
@media (prefers-reduced-motion: reduce) {
.carousel__snapper {
animation-name: none;
}
}
.carousel:hover .carousel__snapper,
.carousel:focus-within .carousel__snapper {
animation-name: none;
}
.carousel__navigation {
position: absolute;
right: 0;
bottom: 0;
left: 0;
text-align: center;
}
.carousel__navigation-list,
.carousel__navigation-item {
display: inline-block;
}
.carousel__navigation-button {
display: inline-block;
width: 1.5rem;
height: 1.5rem;
background-color: #333;
background-clip: content-box;
border: 0.25rem solid transparent;
border-radius: 50%;
font-size: 0;
transition: transform 0.1s;
}
.carousel::before,
.carousel::after,
.carousel__prev,
.carousel__next {
position: absolute;
top: 50px;
margin-top: 17%;
width: 4rem;
height: 4rem;
transform: translateY(-50%);
border-radius: 50%;
font-size: 0;
outline: 0;
}
.carousel::before,
.carousel__prev {
left: -1rem;
}
.carousel::after,
.carousel__next {
right: -1rem;
}
.carousel::before,
.carousel::after {
content: '';
z-index: 1;
background-color: #333;
background-size: 1.5rem 1.5rem;
background-repeat: no-repeat;
background-position: center center;
color: #fff;
font-size: 2.5rem;
line-height: 10rem;
text-align: center;
pointer-events: none;
}
.carousel::before {
background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolygon points='0,50 80,100 80,0' fill='%23fff'/%3E%3C/svg%3E");
}
.carousel::after {
background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolygon points='100,50 20,100 20,0' fill='%23fff'/%3E%3C/svg%3E");
}

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

<h1>CSS-only Carousel</h1>
<p>This carousel is created with HTML and CSS only.</p>
<section class="carousel" aria-label="Gallery">
<ol class="carousel__viewport">
<li id="carousel__slide1" tabindex="0" class="carousel__slide">
<div class="carousel__snapper">
<a href="#carousel__slide4" class="carousel__prev">Go to last slide</a>
<a href="#carousel__slide2" class="carousel__next">Go to next slide</a>
</div>
</li>
<li id="carousel__slide2" tabindex="0" class="carousel__slide">
<div class="carousel__snapper"></div>
<a href="#carousel__slide1" class="carousel__prev">Go to previous slide</a>
<a href="#carousel__slide3" class="carousel__next">Go to next slide</a>
</li>
<li id="carousel__slide3" tabindex="0" class="carousel__slide">
<div class="carousel__snapper"></div>
<a href="#carousel__slide2" class="carousel__prev">Go to previous slide</a>
<a href="#carousel__slide4" class="carousel__next">Go to next slide</a>
</li>
<li id="carousel__slide4" tabindex="0" class="carousel__slide">
<div class="carousel__snapper"></div>
<a href="#carousel__slide3" class="carousel__prev">Go to previous slide</a>
<a href="#carousel__slide1" class="carousel__next">Go to first slide</a>
</li>
</ol>
<aside class="carousel__navigation">
<ol class="carousel__navigation-list">
<li class="carousel__navigation-item">
<a href="#carousel__slide1" class="carousel__navigation-button">Go to slide 1</a>
</li>
<li class="carousel__navigation-item">
<a href="#carousel__slide2" class="carousel__navigation-button">Go to slide 2</a>
</li>
<li class="carousel__navigation-item">
<a href="#carousel__slide3" class="carousel__navigation-button">Go to slide 3</a>
</li>
<li class="carousel__navigation-item">
<a href="#carousel__slide4" class="carousel__navigation-button">Go to slide 4</a>
</li>
</ol>
</aside>
</section>

<!-- end snippet -->

It is appreciated that you use time to read my dump question, thanks

I tried to change the CSS in order to fix however cannot find a right way.
".carousel" is the property that control the outer-box that contains the whole carousel, as i only need it to obtain part of the screen, i changed its padding-top to 25%

As
'.carousel_viewport' is the inner part of previous, so i also changed its "top right bottom left" these four, but nothing changed

Also tried below properties but still fail.

.carousel::before,
.carousel::after,
.carousel__prev,
.carousel__next {
position: absolute;
top: 50px;
margin-top: 17%;
}

It seems you cannot disable this behaviour from what I know, this is the downside of using this specific CSS-only slider.

This is because the slider controls are using anchors, eg the buttons are links (<a> tags) with adresses of the form #slide_to_reach. The original goal of anchors in HTML was to reach (scroll to) a specific part of the document.

So this is a built-in in all browsers, by clicking on the buttons you will scroll to the anchor. To find a way not to scroll with this specific slider would mean the slider will no longer work, sorry.