代码如下:

<div style="background:#BEF7BB;width:400px;height:200px;">    <div style="background:#F7EFAC; width:200px; height:100px; margin-top:30px; margin-left:20px; padding:0"></div> </div> 解决办法: 解决方法有两个,方法一:是在父级div上加overflow:hidden或者overflow:auto <div style="background:#BEF7BB;width:400px;height:200px;overflow:hidden">    <div style="background:#F7EFAC; width:200px; height:100px; margin-top:30px; margin-left:20px; padding:0"></div> </div> <div style="background:#BEF7BB;width:400px;height:200px;overflow:auto">    <div style="background:#F7EFAC; width:200px; height:100px; margin-top:30px; margin-left:20px; padding:0"></div> </div> 方法二:是在子级div中加上float参数 <div style="background:#BEF7BB;width:400px;height:200px;">    <div style="background:#F7EFAC; width:200px; height:100px; margin-top:30px; margin-left:20px; padding:0; float:left; display:inline"></div> </div>