div的使用 - DIVCSS5

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<style>
 .all{
 width:500px;
 height:500px;
 margin:0 auto;
 background-color:#000;
 }
 .one{
 height:100px;
 background-color:#89E1BF;
 }
 .two{
 height:100px;
 background-color:#DEE099;
 }
 .three{
 height:100px;
 background-color:#D7A1CE;
 }
 
</style>
<body>
 <!--父div，all是黑色-->
 <div class="all">
 <!--子div，one是绿色-->
 <div class="one">
 </div>
 <!--子divtwo，是黄色-->
 <div class="two">
 </div>
 <!--子div，three是紫色-->
 <div class="three">
 </div>
 </div>
</body>
</html>

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