body {
    margin: 0;
    height: 100vh;
    background: #0d0f12;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    background: #1b1f24;
    border: 2px solid #2c333b;
    cursor: crosshair;
    max-width: 100%;
}