【jQuery】slick slideをメインビジュアル部分にwidth:100%で組み込む #HTML

index.html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>slick_slide_project</title>
  <link rel="stylesheet" href="js/slick-theme.css">
  <link rel="stylesheet" href="js/slick.css">
  <link rel="stylesheet" href="css/style.css">
</head>
<body>
  <header class="header">
    <h1 class="h1_title">
      <img src="img/cat01.jpg" alt="">
    </h1>
    <div class="single">
      <!--任意のスライド用画像のパス-->
    </div>
    <nav>
      <ul>
        <li>
          <a href="">Home</a>  
        </li>
        <li>
          <a href="#about">About</a>
        </li>
        <li>
          <a href="#skills">Skills</a>
        </li>
        <li>
          <a href="#portfolio">Portfolio</a>
        </li>
      </ul>
    </nav>
  </header>
  <main></main>
  <footer></footer>
  <script src="js/jquery.min.js"></script>
  <script src="js/slick.min.js"></script>
  <script type="text/javascript">
    $(document).ready(function(){
      $('.single').slick({
        autoplay:true,
        dots:false,
      });
    });
  </script>
</body>
</html>

style.css

nav {
  background-color: #20b2aa;
}

nav ul {
  width: 1000px;
  margin: 0 auto;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}

nav ul li {
  border-left: 1px solid white;
  width: 100%;
  margin: 0 auto;
  text-align: center;
}

nav ul li:last-child {
  border-right: 1px solid white;
}

nav ul li a {
  display: block;
  padding: 20px 0;
}

nav ul li a:hover {
  background-color: aquamarine;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}

.header {
  position: relative;
}

.h1_title {
  position: absolute;
  text-align: center;
  top: 0;
  right: 0;
  left: 0;
  margin: 0 auto;
  z-index: 1000;
}

.h1_title img {
  width: 500px;
}

.single {
  margin: 0 auto;
  width: 100%;
}

.single img {
  height: auto;
  width: 100%;
}

/*slick setting*/
.slick-prev:before,
.slick-next:before {
  color: #000;
}

.slick-prev {
  left: 25px;
  z-index: 1;
}

.slick-next {
  right: 25px;
}

.slick-prev:before, .slick-next:before {
  color: white;
  font-size: 40px;
}

* {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

ol, ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: black;
}