.go-top{position:fixed;top:50%;right:20px;width:50px;z-index:9999;border:1px solid #ddd;border-radius:5px;display:flex;height:100px;flex-direction:column;flex-wrap:wrap-reverse}
.go-top .service{
    background: #fff url(./pc/images/kf2.png) center no-repeat;
    background-size: 30px;
    flex:1;height:30px;text-align:center}
.go-top .service:last-child{
    background: #fff url(./pc/images/kf4.png) center no-repeat;
    background-size: 30px;
}
.go-top .service:last-child{margin-bottom:0}
.go-top .service span{font-size:12px;color:#fff;font-weight:500;letter-spacing:2px}
.go-top .service img{width:30px;height:30px}
.go-top .service span{display:none}
.go-top .service:hover{display: flex;height:50px;background:#009900;padding:0 10px;align-items:center; text-decoration:none}
.go-top .service:hover img{display:none}
.go-top .service:hover span{display:block;text-decoration:none}