<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>float</title>
<style>
.outer{
background-color:blue;
overflow:hidden; /*不用添加div，添加该项依然可以实现保持背景颜色不变*/
}
.me1{
100px;
height: 50px;
color:gold;
float:left;
background-color: purple;
}
.me2{
100px;
height: 50px;
color:gold;
float:left;
background-color: #1ecc86;
}
.bottom{
text-align: center;
background-color: #c39;
}
/*.clear{*/
/*clear: both;*/
/*}*/
/*使空标签占一整行*/
</style>
</head>
<body>
<div class="outer">
<div class="me1">menu1</div>
<div class="me2">menu2</div>
<!--<div class="clear"></div>-->
</div>
<div class="bottom">bottom</div>
</body>
</html>