body {
    margin: 0px;
    padding: 0px;
    width: 100%;
    background-image: url(img/bodybg.png);
    background-repeat: repeat;
    background-position: center;
    overflow: hidden;
}
canvas {
    display: block;
    margin-top: 0px;
    margin-left: auto;
    margin-right: auto;
    position: absolute;
}