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<style> .tag { background-color: #de3f33; position: relative; text-align: center; color: #fff; line-height: 40px; width: 150px; margin: 100px auto; } .tag:before { content: ‘‘; width: 0; height: 0; border-bottom: 5px solid #b23838; border-left: 5px solid transparent; position: absolute; top: -5px; left: 0; } </style>
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原文地址：http://www.cnblogs.com/talentzemin/p/4848651.html
