css中的浮动
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title> css本单元课程小结 </title>
<style type="text/css">
ul li{list-style:none;width:150px;height:50px;line-height:40px;text-align:center;background-color:#ccc;margin:0px 1px;float:left;}
.box1{width:150px;height:50px;background-color:#0000FF;float:left;line-height:40px;margin:0px 1px;text-align:center;}
.clear{clear:both;}
</style>
</head>
<body>
<ul>
<li>菜单1</li>
<li>菜单2</li>
<li>菜单3</li>
<li>菜单4</li>
<li>菜单5</li>
</ul>
<div> </div>
<div> div1 </div>
<div> div1 </div>
<div> div1 </div>
</body>
</html>