HTML 在线编辑器| BEGTUT.COM

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {margin: 0;}

ul.sidenav {
  list-style-type: none;
  margin: 0;
  padding: 0;
  width: 25%;
  background-color: #f1f1f1;
  position: fixed;
  height: 100%;
  overflow: auto;
}

ul.sidenav li a {
  display: block;
  color: #000;
  padding: 8px 16px;
  text-decoration: none;
}
 
ul.sidenav li a.active {
  background-color: #4CAF50;
  color: white;
}

ul.sidenav li a:hover:not(.active) {
  background-color: #555;
  color: white;
}

div.content {
  margin-left: 25%;
  padding: 1px 16px;
  height: 1000px;
}

@media screen and (max-width: 900px) {
  ul.sidenav {
    width: 100%;
    height: auto;
    position: relative;
  }
  
  ul.sidenav li a {
    float: left;
    padding: 15px;
  }
  
  div.content {margin-left: 0;}
}

@media screen and (max-width: 400px) {
  ul.sidenav li a {
    text-align: center;
    float: none;
  }
}
</style>
</head>
<body>

<div class="content">
  <h2>响应式侧边导航示例</h2>
  <p>当屏幕尺寸为 900 像素或更小时，此示例使用媒体查询将侧边导航转换为顶部导航栏。</p>
  <p>我们还为 400 像素或更小的屏幕添加了媒体查询，它将垂直堆叠导航链接并将其居中。</p>
  <p>稍后您将在我们的 CSS 教程中了解有关媒体查询和响应式网页设计的更多信息。</p>
  <h3>调整浏览器窗口大小以查看效果。</h3>
</div>

</body>
</html>