<!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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关键字：
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