html,
body{
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background-color: #000000;
    overflow: hidden;
    top: 50%;
    left: 50%;
    orientation: landscape;
}
canvas {
    display:block;
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    overflow: hidden;
    orientation: landscape;
}