css实现圆环元素装饰特效

.green-info {position:relative}
.green-info:before {
    content: "";
    position: absolute;
    left: 0;
    top: 13px;
    width: 12px;
    height: 12px;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    -o-border-radius: 50%;
    border-radius: 50%;
    border: 2px solid #f0be4d;
}