标签：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
#main
{
width:220px;
height:300px;
border:1px solid black;
display:flex;
}
#main .a1{
flex:2;
}
#main .a2{
flex:1;
}
#main .a3{
flex:2;
}
</style>
</head>
<body>
<div id="main">
<div class="a1" style="background-color:coral;">红色</div>
<div class="a2" style="background-color:lightblue;">蓝色</div>
<div class="a3" style="background-color:lightgreen;">带有更多内容的绿色 div</div>
</div>
</body>
</html>
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原文地址：http://www.cnblogs.com/he0xff/p/5641972.html
