<!doctype html><html><head><meta charset="utf-8"><title>html&jquery</title><style type="text/css"> .box{ text-align: center; border:10px yellow solid; height:450px; width:300px; font-family: Microsoft YaHei; top:25%; left:25%; bottom: 25%; right:25%; box-shadow: 20px 20px 10px black; margin:auto; font-weight:bold; background:rgba(17,44,255,0.63); position: absolute; } </style></head><body><div class="box"></div><script src="jquery-3.2.0.min.js">hahahahahahaahahahahahhahahahaahhaahahah</script></body></html>
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