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HTML 

              
                <body>
  <link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css"/>
  <link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick-theme.css"/>
  <header class="header">
    <div class="content-wrapper header-nav">
      <h1>XX株式会社</h1>
      <!-- navメニューについては、今回は割愛 -->
      <!-- <nav>
        <ul>
          <li><a href="#">トップページ</a></li>
          <li><a href="#">会社概要</a></li>
          <li><a href="#">事業内容</a></li>
          <li><a href="#">採用情報</a></li>
          <li><a href="#">お問い合わせ</a></li>
        </ul>
      </nav> -->
    </div>
  </header>
  <div class="mainvisual content-wrapper">
    <div class="slider">
      <div><img src="https://images.unsplash.com/photo-1606501126768-b78d4569d3f9?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=870&q=80" alt="" /></div>
      <div><img src="https://images.unsplash.com/photo-1504328345606-18bbc8c9d7d1?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=870&q=80" alt="" /></div>
      <div><img src="https://images.unsplash.com/photo-1598299803204-b73796f43289?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=870&q=80" alt="" /></div>
    </div>
    <h2>ものづくりが好き</h2>
  </div>
  
  
  <script src="https://code.jquery.com/jquery-3.6.1.min.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.min.js">
  </script>
</body>
!

CSS 

              
                @charset "UTF-8";

body {
  margin: 0;
  padding: 0;
  font-family: "Yu Gothic", "游ゴシック", YuGothic, "游ゴシック体", sans-serif;
  font-weight: 500;
  color: #333;
  line-height: 2.0;
}
h1 {
  font-size: 2rem;
  color: #ffffff;
}
h2,h3,h4,h5 {
  margin: 0;
  padding: 0;
}

img {
  width: 100%;
  vertical-align: bottom;
}

a { 
  text-decoration: none;
  color: #000;
}

a:hover { 
  transition: .3s;
  opacity: 0.6;
}

section {
  margin-bottom: 120px;
}

.content-wrapper {
  max-width: 1400px; /* 画面サイズで可変するように"max-"を追加 */
  padding: 0 20px; /* 左右に余白を作る */
  margin: 0 auto;
}

/* ---------
  header 
------------*/
.header-nav {
  height: 100px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* navメニューについては、今回は割愛 */
/* .header nav ul {
  display: flex;
  justify-content: space-between;
  align-items: center;
} */

/* .header nav ul li {
  margin-right: 50px;
} */

/* ---------
  mainvisual 
------------*/
.mainvisual {
  position: relative;
  width: 100%;
  height: 600px;
}

.slider {
  position: relative;
  height: 500px;
  width: 100%;
/*   margin-left: 30%; */
}

.slider img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  margin-left: 30%;
}

.mainvisual h2 {
  position: absolute;
  top: 30%;
  left: 20%;
  background: rgba(255, 255, 255, 0.9);
  font-size: 3rem;
  padding: 1rem;
}

.mainvisual::before {
  position: absolute;
  content: "";
  background: #333;
  height: 700px;
  width: 45%;
  top: -18%;
  left: 0;
  z-index: -1;
}

/* 空タグは使わず、擬似要素で実装 */
/* .bg1 {
  background: #e8e7e7;
  height: 700px;
  width: 45%;
  position: absolute;
  top: -18%;
  left: 0;
  z-index: -1;
} */

.slick-arrow:before{
	content:""!important;
/*   左右の矢印が出てしまうので、強制的に消す */
}
!

JS 

              
                $(function () {
  $(".slider").slick({
    autoplay: true,
    autoplaySpeed: 2000,
    speed: 2000,
    fade: true,
    cssEase: 'linear'
    });
});
!
999px

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