#btnTopo{background-color:#2e7d32;border:none;border-radius:50%;bottom:20px;box-shadow:0 2px 4px rgba(0,0,0,.3);color:#fff;cursor:pointer;display:none;font-size:18px;left:30px;outline:none;padding:17px 20px;position:fixed;transition:background-color .3s,transform .3s,box-shadow .3s;z-index:99}#btnTopo:hover{background-color:#1b5e20;box-shadow:0 4px 6px rgba(0,0,0,.4)}#btnTopo:active{background-color:#155518;box-shadow:0 1px 2px rgba(0,0,0,.2);transform:scale(.95)}