CSS3 radio 或checkbox 自定义 样式

.style-radio {position:relative;width:15px;height:15px;outline:none;}
.style-radio:after {position:absolute;top:-2px;left:-3px;display:inline-block;width:18px;height:18px;content:'';border:1px solid #dcdcdc;background-color:#fff;border-radius:50%;}
.style-radio:checked:after {border:1px solid #845f3f;content:'';background:url(../images/succ_fff.png) no-repeat center #845f3f;background-size:12px auto;}