body {
    font - family: Arial, sans - serif;
    display: flex;
    flex - direction: column;
    align - items: center;
    padding: 20px;
    background: #f5f5f5;
}

canvas {
    border: 2px solid #ccc;
    margin - bottom: 10px;
}

.controls {
    display: flex;
    gap: 10px;
    flex - wrap: wrap;
    justify - content: center;
    margin - bottom: 20px;
}

select,
button {
    padding: 8px;
    font - size: 16px;
}