.el-backtop{position:fixed;background-color:#fff;width:40px;height:40px;border-radius:50%;color:#3d7eff;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:0 0 6px rgba(0,0,0,.12);cursor:pointer;z-index:5}.el-backtop:hover{background-color:#f2f6fc}