* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: black;
}
canvas {
    background: black;
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}