老师 求指导
<!DOCTYPE html>
<html>
<head>
<!-- 此处编写样式 -->
<meta charset="utf-8"/>
<style>
*{margin:0; padding:0;}
.two,.three{
overflow: hidden;
zoom: 1;
padding: 20px;
}
.content{
float: left;
padding: 10px;
margin: 5px;
border: 1px solid gray;
}
.one{
width:50%;
text-align:center;
border: 1px gray dashed;
margin: 0 25% 0;}
</style>
</head>
<body>
<div class="one">
<div class="two">
<div class="content">
<img src="http://img1.sycdn.imooc.com\/climg/590fe9770001e63102400135.jpg"/>
<p>欢迎来到慕课网学习</p>
</div>
<div class="content">
<img src="http://img1.sycdn.imooc.com\/climg/590fe97d00011bda02400135.jpg"/>
<p>欢迎来到慕课网学习</p>
</div>
<div class="content">
<img src="http://img1.sycdn.imooc.com\/climg/590fe9770001e63102400135.jpg"/>
<p>欢迎来到慕课网学习</p>
</div>
</div>
<div class="three">
<div class="content">
<img src="http://img1.sycdn.imooc.com\/climg/590fe9770001e63102400135.jpg"/>
<p>欢迎来到慕课网学习</p>
</div>
<div class="content">
<img src="http://img1.sycdn.imooc.com\/climg/590fe97d00011bda02400135.jpg"/>
<p>欢迎来到慕课网学习</p>
</div>
<div class="content">
<img src="http://img1.sycdn.imooc.com\/climg/590fe982000150ba02400135.jpg"/>
<p>欢迎来到慕课网学习</p>
</div>
</div>
</div>
</body>
</html>
正在回答
同学你好,同学最外层父元素的宽度设置的不对,因为每一列的宽度为240(图片宽度)+20(左右padding)+2(左右边框)+ 10(左右margin)为272px,那么三列的宽度为816px,而two容器又设置了左右padding各20px,那么总的宽度就为816+40=856px,参考:

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