<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.main {
position: absolute;
left: 0;
top: 0;
background-color: aquamarine;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
width: 100%;
height: 100%;
}
.top {
height: 60px;
width:90%;
background-color: red;
text-align:center;
}
.container{
width: 90%;
background-color: gray;
flex: 1; /**占据所有剩余空间**/
text-align:center;
display: flex;
}
.left, .right{
width:100px;
background-color:green;
//flex:1;/**想要3个div均等划分就开放此设置**/
}
.center{
flex:1;
}
.bottom {
width: 90%;
height: 60px;
background-color: red;
text-align:center;
}
</style>
</head>
<body>
<div class="main">
<div class="top">
top
</div>
<div class="container">
<div class="left">left</div>
<div class="center">center</div>
<div class="right">right</div>
</div>
<div class="bottom">footer</div>
</div>
</body>
</html>
原文：https://www.cnblogs.com/itjeff/p/10911380.html