.h100 { height: 100px; position: relative;}
.advimg{position: relative;display: block;}
.advimg a:before{left: 0px; bottom: 0px; position: absolute; text-align: center; border-top-right-radius: 5px; font-size: 10px; line-height: 14px; width: 26px;  color:#fff; background-color: #9e9e9e;}
.advimg a:before { content:"广告";}