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<div style="border:2px solid red; width:400px; height:200px;">c<div style="width:100px; height:100px; border:5px solid blue; margin:10px; right:0px; bottom:0px; position:absolute">你好啊！</div></div>
<div style="border:2px solid red; width:400px; height:200px; position:absolute">d<div style="width:100px; height:100px; border:5px solid blue; margin:10px; right:0px; bottom:0px; position:absolute">你好吗？</div></div>
<div style="width:100px; height:100px; border:5px solid blue; margin:10px; right:0px; bottom:0px; position:fixed;">你好</div>
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原文：http://www.cnblogs.com/zyg316/p/5517800.html