请老师检查代码 3-31

来源：3-31 编程练习

KangarooL

2021-02-25 22:24:37

相关代码：

<!DOCTYPE html>
<html>
<head>
    <title></title>
	<style type="text/css">
		div{
			width: 200px;
			height:150px;
			background-color: #eee;
			margin-top: 5px;
		}
		section{
			width: 200px;
			height: 30px;
			margin-bottom: 5px;
			background-color: #ff0;
		}
		/*此处写代码*/
		div:empty {
		    background-color:#f00;
		}
		section:empty {
		    background-color:#abcedf;
		}
	</style>
</head>
<body>
	<div>
		<section>one</section>
		<section>two</section>
	</div>
	<div></div>
	<div>
		<section>three</section>
		<section>four</section>
		<section>five</section>
		<section></section>
	</div>
</body>
</html>