howto 在线编辑器 | howto代码测试

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://cdn.cainiaomax.com/cdnjs/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

.navbar {
  overflow: hidden;
  background-color: #333;
  font-family: Arial, Helvetica, sans-serif;
}

.navbar a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  font-size: 16px;  
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font: inherit;
  margin: 0;
}

.navbar a:hover, .dropdown:hover .dropbtn {
  background-color: red;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  width: 100%;
  left: 0;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content .header {
  background: red;
  padding: 16px;
  color: white;
}

.dropdown:hover .dropdown-content {
  display: block;
}

/* 创建三个相等的并排浮动的列 */
.column {
  float: left;
  width: 33.33%;
  padding: 10px;
  background-color: #ccc;
  height: 250px;
}

.column a {
  float: none;
  color: black;
  padding: 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

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

/* 清除列后的浮点数 */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* 响应式布局 - 使三列堆叠在彼此之上而不是彼此相邻 */
@media screen and (max-width: 600px) {
  .column {
    width: 100%;
    height: auto;
  }
}
</style>
</head>
<body>

<div style="padding:16px">
  <h3>响应式超级菜单（导航栏中的全宽下拉菜单）</h3>
  <p>将鼠标悬停在“下拉”链接上以查看大型菜单。</p>
  <p>调整浏览器窗口大小以查看响应效果。</p>
</div>

</body>
</html>

报个问题: