在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>* {box-sizing: border-box;}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.topnav {
  overflow: hidden;
  background-color: #e9e9e9;
}

.topnav a {
  float: left;
  display: block;
  color: black;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav a.active {
  background-color: #2196F3;
  color: white;
}

.topnav .search-container {
  float: right;
}

.topnav input[type=text] {
  padding: 8px;
  margin-top: 8px;
  font-size: 17px;
  border: none;
}

.topnav .search-container button {
  float: right;
  padding: 6px;
  margin-top: 8px;
  margin-right: 16px;
  background: #ddd;
  font-size: 17px;
  border: none;
  cursor: pointer;
}

.topnav .search-container button:hover {
  background: #ccc;
}

@media screen and (max-width: 600px) {
  .topnav .search-container {
    float: none;
  }
  .topnav a, .topnav input[type=text], .topnav .search-container button {
    float: none;
    display: block;
    text-align: left;
    width: 100%;
    margin: 0;
    padding: 14px;
  }
  .topnav input[type=text] {
    border: 1px solid #ccc;  
  }
}
</style>
</head>
<body>

<div class="topnav">
  <a class="active" href="#home">主页</a>
  <a href="#about">关于</a>
  <a href="#contact">联系我们</a>
  <div class="search-container">
    <form action="https://www.cainiaoplay.com/action_page.php">
      <input type="text" placeholder="搜索.." name="search">
      <button type="submit">提交</button>
    </form>
  </div>
</div>

<div style="padding-left:16px">
   <h2>响应式搜索菜单</h2>
   <p>导航栏里面有一个搜索框。</p>
   <p>调整浏览器窗口的大小, 查看效果。</p>
</div>

</body>
</html>
源代码

动行结果
