.scroll-to-top{position:fixed;z-index:99991;bottom:20px;right:20px;width:35px;height:35px;background-color:#212129;border-radius:3px;cursor:pointer}.scroll-to-top:before{content:"";position:absolute;top:-10px;bottom:-10px;left:-10px;right:-10px}.scroll-to-top:after{content:"";position:absolute;top:50%;left:50%;width:0;height:0;margin-top:-4px;margin-left:-6px;border-left:6px solid #fff0;border-right:6px solid #fff0;border-bottom:6px solid #fff}0