JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css">
<link rel="stylesheet" href="//cdn.jsdelivr.net/gh/kenwheeler/slick@1.8.1/slick/slick-theme.css">
<script src="https://code.jquery.com/jquery-3.7.1.js"></script>
<script src="//cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.min.js"></script>
<!-- <link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css" />
<link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/gh/kenwheeler/slick@1.8.1/slick/slick-theme.css" /> -->

<h1 style="text-align: center; color: #fff; height: 0; position: relative; z-index: 1;">JavaScript 系列四：第6課
  ──kenwheeler/slick套件</h1>

<div class="gallery">
  <div class="pics">
    <div><img src="https://picsum.photos/1200/900?random=11" alt=""></div>
    <div><img src="https://picsum.photos/1200/900?random=12" alt=""></div>
    <div><img src="https://picsum.photos/1200/900?random=13" alt=""></div>
    <div><img src="https://picsum.photos/1200/900?random=14" alt=""></div>
    <div><img src="https://picsum.photos/1200/900?random=15" alt=""></div>
  </div>
  <button class="gallery-btn prev-btn"></button>
  <button class="gallery-btn next-btn"></button>
</div>

<!-- <script src="https://code.jquery.com/jquery-3.7.1.js" integrity="sha256-eKhayi8LEQwp4NKxN+CfCh+3qOVUtJn3QNZ0TciWLP4=" crossorigin="anonymous"></script>

<script type="text/javascript" src="//cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.min.js"></script> -->

CSS

* {
  padding: 0;
  margin: 0;
}

body {
  background-color: #ccc;
}

.gallery {
  width: 100%;
  height: 100vh;
  position: relative;
}

.gallery div {
  width: 100%;
  height: 100%;
}

.gallery .pics img {
  display: block;
  width: 100%;
  object-fit: cover;
  object-position: center center;
}

.gallery-btn {
  display: block;
  width: 50px;
  height: 50px;
  line-height: 50px;
  border-radius: 50%;
  background-color: rgba(200, 200, 200, 0.3);
  border: none;
  font-size: 30px;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
  overflow: hidden;
  transition: 0.3s;
}

.gallery-btn.prev-btn {
  left: 20px;
}

.gallery-btn.next-btn {
  right: 20px;
}

.gallery-btn.prev-btn::after,
.gallery-btn.next-btn::after {
  content: "";
  width: 10px;
  height: 10px;
  border: 5px solid rgba(100, 100, 100, 0.7);
  background-color: transparent;
  position: absolute;
  top: 50%;
  transition: 0.5s;
}

.gallery-btn.prev-btn::after {
  border-top: none;
  border-right: none;
  left: 50%;
  transform: translateX(-35%) translateY(-50%) rotate(45deg);
}

.gallery-btn.next-btn::after {
  border-bottom: none;
  border-left: none;
  right: 50%;
  transform: translateX(35%) translateY(-50%) rotate(45deg);
}

.gallery-btn:hover {
  background-color: rgba(200, 200, 200, 0.7);
}

.gallery-btn:hover.prev-btn::after,
.gallery-btn:hover.next-btn::after {
  border-color: rgba(70, 70, 70, 1);
}

.gallery .slick-dots {
  margin: 0;
  bottom: 25px;
}

JavaScript

$(".pics").slick({
  autoplay: true,
  speed: 500,
  dots: true,
  prevArrow: $(".prev-btn"),
  nextArrow: $(".next-btn")
});