<!DOCTYPE html>
<html>
<head>
<title>下拉菜单实例</title>
<meta charset="utf-8">
<style>
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropdown {
position: relative;
display: inline-block;
float:right
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
float:right;
right:0
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
white-space:nowrap;
text-align:center
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
</style>
</head>
<body>
<h2>下拉菜单</h2>
<p>鼠标移动到按钮上打开下拉菜单。</p>
<div class="dropdown">
<button class="dropbtn">下拉菜单</button>
<div class="dropdown-content">
<a href="//www.runoob.com">菜鸟教程 1菜鸟教程 1菜鸟教程 1</a>
<a href="//www.runoob.com">菜鸟教程 2</a>
<a href="//www.runoob.com">菜鸟教程 3</a>
</div>
</div>
</body>
</html>
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