body {
    background: #404040;
    margin: 0px 0px 0px 0px;
}


canvas {
    display: block;
    margin: 0;
    position: absolute;
    width: 100% !important;
    height: 100% !important;
    top: 0px !important;
    left: 0px !important;
    z-index: 100 !important;
}