span{height:40px; width:40px; 显示: block; position:relative; }
. demoSpan1{width:22px; }
. demo span 1: before { content : '; height:12px; width:12px; border :5 px固态蓝色; 显示: block; 位置: absolute; top:2px;
left:0px; z-index:1; 后台: # FFf; line-height:26px;
border-radius:40px; -webkit-border-radius:40px; -moz-border-radius:40px; color:#fff; 文本对齐3360中心; }
. demo span 1: after { content : '; 高:0 px; width:0px; 显示: block; 位置: absolute; bottom:2px; left:1px; border:10px
透明实体; 边框顶部颜色:蓝色; border-width :20 px 10 px0px 10 px; }