纯CSS制作三角形和小圆点
.arrowbox{width:40px;height:30px;background: #333;padding:10px;position: relative;text-align:center;margin:20px;color:#fff;line-height:30px;font-size:12px;}
.arrowbox span{display: inline-block;overflow:hidden;vertical-align: middle;position:absolute;top:22px;right:5px;line-height:12px;font-size:12px;}
.arrowbox span em{display:block;font-family:"Simsun";font-style:normal;font-weight:normal;}
.arrowbox span.size1{width:7px;height:4px;}
.arrowbox span.w_e{width:4px;height:7px;}
.arrowbox span.size2{width:14px;height:8px;}
.arrowbox span em.north{color:#fff;margin:-7px 0 0 -2px;}
.arrowbox span em.south{color:#fff;margin:0 0 0 -2px;}
.arrowbox span.w_e em.east{color:blue;margin: -2px 0 0 -7px;}
.arrowbox span.w_e em.west{color:yellow;margin:-2px 0 0 0;}
.arrowbox span.size2 em.south{margin:-5px 0 0 0}
.arrowbox span.size2 em.north{margin:2px 0 0 0}
.round{width:16px;height:16px;display: inline-block;font-size:20px;line-heigth:16px;text-align:center;color:#f00;text-decoration:none}
.round:hover{color:blue;text-decoration:none}
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用font-size控制圆点的大小
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提示：你可以先修改部分代码再运行。
