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li{ text-align:left; 300px; height:100px; margin:0px auto; padding:20px 10px; color:#fff;
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<li class="con"><a>CSS实现背景透明，文字不透明（各浏览器兼容）CSS实现背景透明</a></li>
<li class="con"><a>CSS实现背景透明，文字不透明（各浏览器兼容）CSS实现背景透明</a></li>
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