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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100svh;
    background-color: #222;
}

canvas {
    width: min(100svw, 100svh);
    height: min(100svw, 100svh);
    background-color: #333;
}