老师，求检查PHP就业班CSS浮动章节4-11的代码
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
<style type="text/css">
.one{float: left;margin: 20px 30px;border: 2px dotted red;}
.box{width: 1000px;}
</style>
</head>
<body>
<div class="box">
<div class="one">
<img src="http://climg.mukewang.com/590fe9770001e63102400135.jpg">
<p>欢迎来到慕课网学习新知识1</p>
</div>
<div class="one">
<img src="http://climg.mukewang.com/590fe97d00011bda02400135.jpg">
<p>欢迎来到慕课网学习新知识2</p>
</div>
<div class="one">
<img src="http://climg.mukewang.com/590fe982000150ba02400135.jpg">
<p>欢迎来到慕课网学习新知识3</p>
</div>
</div>
<div class="box">
<div class="one">
<img src="http://climg.mukewang.com/590fe9770001e63102400135.jpg">
<p>欢迎来到慕课网学习新知识4</p>
</div>
<div class="one">
<img src="http://climg.mukewang.com/590fe97d00011bda02400135.jpg">
<p>欢迎来到慕课网学习新知识5</p>
</div>
<div class="one">
<img src="http://climg.mukewang.com/590fe982000150ba02400135.jpg">
<p>欢迎来到慕课网学习新知识6</p>
</div>
</div>
</body>
</html>
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Html5
CSS3
PHP