body {
    background: #0b1d3a;
    color: white;
    font-family: Arial, sans-serif;
    text-align: center;
}
canvas {
    background: #102c54;
    border: 2px solid white;
    display: block;
    margin: 10px auto;
}
button {
    margin: 5px;
    padding: 8px 12px;
    font-size: 15px;
}