<html lang="en">
<head>
<meta charset="UTF-8">
<title>景安</title>
</head>
<style type="text/css">
.head{width: 1000pxheight: 200pxmargin:0 auto}
.head-a{width: 30%height: 200pxbackground: bluefloat: left}
.head-b{width: 70%height: 200pxbackground: orangefloat: right}
</style>
<body>
<div class="head">
<div class="head-a"></div>
<div class="head-b"></div>
</div>
</body>
</html>
我们可以使用width：30%和width：70%这样的形式来设置百分比
style type="text/css">body,html{margin:0padding:20pxfont-size:12pxfont-family:Arialfont:12px/1 Tahoma, Arial}
.stepOut{height:20pxborder:1px solid #000background:#eeewidth:200pxoverflow:hiddendisplay:none}
.stepIn{width:50pxbackground:#FF0080border-top:1px
solid #FFB5DAborder-bottom:1px solid
#fffoverflow:hiddencolor:#ffftext-align:centerfont:12px/1.6 arial}
</style>
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