body {
    font-family: Arial, sans-serif;
    background-color: #222;
    color: #fff;
    text-align: center;
    margin: 0;
    padding: 0;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    padding: 20px;
}

canvas {
    background-color: #333;
    display: block;
    margin: 0 auto;
}