How to write a secondary drop-down menu in css: first create an HTML sample file; then use the display attribute of css to control whether the secondary drop-down menu is displayed or not; and finally check the running effect through the browser.
The operating environment of this tutorial: Dell G3 computer, Windows7 system, Chrome76.0&&CSS3 version.
Recommendation: "css video tutorial"
Pure CSS to implement secondary navigation drop-down menu
Thought:
Use the display attribute of css to control whether the secondary drop-down menu is displayed or not. When the mouse moves to the li tag of the first-level navigation menu, the ul tag of the second-level navigation menu is displayed. Since the implementation is relatively simple, the reference code is given directly here.
Pure CSS secondary navigation drop-down menu code
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" content="text/html" http-equiv="content-type">
<title>纯css二级导航下拉菜单</title>
<meta name="keyword" content="关键字">
<meta name="description" content="描述">
<style type="text/css">
*{margin: 0;padding: 0;}
#bg{background: red;width: 100%;height: 35px;}
nav{height: 35px;width: 1000px;margin: 0 auto;}
nav ul li{list-style-type:none;float: left}
nav ul li a{ text-decoration: none;display: block;width: 130px;line-height: 35px;
text-align: center;color:white;font-fimily:微软雅黑;}
nav ul li ul li{float: none}
nav ul li ul li a{color:black}
nav ul li ul{display: none;}
nav ul li:hover ul{display: block;}
</style>
</head>
<body>
<div id="bg">
<nav>
<ul>
<li><a href="#">一级导航</a>
<ul>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
</ul>
</li>
<li><a href="#">一级导航</a>
<ul>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
</ul>
</li>
<li><a href="#">一级导航</a>
<ul>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
</ul>
</li>
<li><a href="#">一级导航</a>
<ul>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
</ul>
</li>
<li><a href="#">一级导航</a>
<ul>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
</ul>
</li>
<li><a href="#">一级导航</a>
<ul>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
</ul>
</li>
<li><a href="#">一级导航</a>
<ul>
<li><a href="#">二级导航</a></li>
<li><a href="#">二级导航</a></li>
</ul>
</li>
</ul>
</nav>
</div>
</body>
</html>Running effect:
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