body {
    margin: 0;
    background: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
canvas {
    border: 10px solid #333;
    border-radius: 20px;
    box-shadow: 0 0 50px rgba(0,0,0,0.8), inset 0 0 10px rgba(255,255,255,0.2);
}