body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f0f0f0;
}

#app {
    text-align: center;
}

#controls {
    margin-bottom: 20px;
}

#controls input[type="number"] {
    width: 70px;
    margin: 0 5px;
}

#controls button.active {
    background: #ffb347;
    color: #222;
}

#controls button {
    margin: 0 2px;
    padding: 4px 10px;
}

canvas {
    border: 1px solid #000;
    background-color: #fff;
}