body {
    margin: 0;
    background: radial-gradient(circle at center, #0a0a0a, #000000);
    overflow: hidden;
    font-family: Arial, sans-serif;
}

canvas {
    display: block;
    margin: auto;
    border: 2px solid #222;
    box-shadow: 0 0 20px #00ffcc55;
}