CSS 左右固定,中间自适应宽度 及 左右自适应宽度,中间固定

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>左右固定,中间自适应</title>
<style>
html ,
body ,
div{
    margin:0;
    padding:0;
}
.left ,
.right {
    float: left;
    width:300px;
    height:300px;
    background:orange;
}
.right{
    float: right;
}
.center{
    height:300px;
    background:red;
}
</style>
</head>
<body>
     
    <div class="left">左边</div>
    <div class="right">右边</div>
    <div class="center">中间</div>
</body>
</html>

  

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>左右自适应,中间固定</title>
<style>
html , 
body , 
div{
	margin:0;
	padding:0;
}
.left,
.right {
	float: left;
	margin: 0 0 0 -300px;
	width: 50%;
}

.main {
	width: 600px;
	float: left;
	background: green;
}
	
.inner {
	padding: 20px;
}
	
.left .inner,
.right .inner {
	margin: 0 0 0 300px;
	background: orange;
}
.left,
.right {
	float: left;
	margin: 0 0 0 -300px;
	width: 50%;
	*width: 49.9%;
}
</style>
</head>
<body>
	
	<div class="left">
		<div class="inner">左边</div>
	</div>
	<div class="main">
		<div class="inner">中间</div>
	</div>
	<div class="right">
		<div class="inner">右边</div>
	</div>

</body>
</html>

  

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