.left {
float: left;
width: 300px;
height: 100px;
background-color: red;
}
.right {
float: right;
width: 300px;
height: 100px;
background-color: blue;
}
.center {
margin: 0px 300px 0px 300px;
background-color: black;
height: 100px;
}
</style>
</head>
<body>
<div class="father">
<div class="left">1</div>
<div class="right">2</div>
<div class="center">3</div>
</div>
</body>
</html>
缺点：会存在塌陷的问题
Flex布局<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.father {
display: flex;
}
.left {
width: 300px
height: 100px;
background-color: red;
}
.center {
flex:1;
height: 100px;
background-color: black;
}
.right {
width: 300px;
height: 100px;
background-color: blue;
}
</style>
</head>
<body>
<div class="father">
<div class="left"></div>
<div class="center"></div>
<div class="right"></div>
</div>
