body {
    margin: 0;
}
canvas {
    width: 100%;
    height: 100%;
}

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
}
canvas {
    display: block;
    width: 100%;
    height: 100%;
}

Make sure that canvas is properlly full screen
Make sure that canvas is properlly full screen
