html, body {
    padding: 0;
    margin: 0;
    background-color: rgb(60, 60, 60);
    overflow: hidden;
    text-align: center;
}

#container {
    display: inline-block;
    position: relative;
}


#UP {
    position: absolute;
    bottom: 20px;
    left: 20px;
    display: none;
}