<!DOCTYPE html><html><head><meta charset="UTF-8"><title></title><style type="text/css">.par{width:180px;height:200px;border:1px solid red;margin-left:30px;margin-top:30px;}.son{width:50px;height:50px;border:1px solid black;}.son2{width:50px;height:50px;border:1px solid green;}</style></head><body><div class="par"><div class="son"></div><div class="son2"></div></div></body></html>
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