html, body{
    padding: 0;
    margin: 0;
    background: #101010;
    overflow: hidden;
}

#canvas-webgl{
    width: 500px;
    height: 500px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -250px;
    margin-top: -250px;
    display: none;
}