body {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #222;
    color: #fff;
    font-family: Arial, sans-serif;
    margin: 0;
    height: 100vh;
    justify-content: center;
}
canvas {
    border: 2px solid #555;
    background-color: transparent;
}