#goTopBtn {display: none;position: fixed;bottom: 80px;right: 30px;z-index: 999;
    border: none;outline: none;color: white;cursor: pointer;background-color:#4f4f4f;border:0;height:0;margin:0px;padding:0px;}
#goTopBtn i{font-size: 3rem; color:green;margin:0;padding:0;outline:none;background:rgba(0,0,0,0);}