<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Document</title><style type="text/css">div{width: 200px;height: 150px;border:2px solid #000;position: relative;}.b{width: 80%;height: 50%;top: 10px;left: 10px;border:2px solid blue;}</style></head><body><div class="a">a</div><div class="b">b</div><div class="c">c</div></body></html>
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