.box{-webkit-box-sizing:border-box;box-sizing:border-box;position:relative;width:20px;height:20px;margin:auto;border-radius:50%;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;cursor:pointer}.box,.box i{border:1px solid #5597fc}.box i{display:block;width:6px;height:6px;border-right:none;border-top:none;-webkit-transform:rotate(-135deg);transform:rotate(-135deg);position:absolute;margin:1px 2px 0 0}.box:hover,.box:hover i{border-color:#73c7ff}