* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: #000;
    overflow: hidden;
}

body {
    display: block;
}

canvas {
    padding: 30px;
    display: block;
    width: 100vw;
    height: 100vh;
    image-rendering: pixelated;
    box-shadow: 0 0 20px rgba(255, 0, 255, 0.2);
}