#scroll-top{display:none;position:fixed;right:20px;bottom:20px;width:40px;height:40px;line-height:40px;background-color:#3b4252;color:#fff;font-size:18px;cursor:pointer;border-radius:2px;text-align:center;z-index:100;box-sizing:content-box}#scroll-top>span{line-height:inherit;vertical-align:top}#scroll-top:hover{background-color:#4c566a}@media only screen and (max-width:480px){#scroll-top{right:10px;bottom:10px;width:26px;height:26px;line-height:24px;font-size:14px}}