body {
    font-family: sans-serif;
    text-align: center;
    background-color: #f0f0f0;
    margin: 0;
    padding: 0;
}

h1 {
    margin-top: 20px;
}

canvas {
    background-color: #fff;
    border: 1px solid #ccc;
    margin-top: 20px;
}