<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>设置背景渐变</title> <style type="text/css"> .big{ width: 300px; height: 300px; background-color: red; margin-top:100px; float: left; } .small{ width: 100px; height: 100px; background-color: blue; margin-top:10px; } </style></head><body><div class="big"> <div class="small"></div></div></body></html>
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