body {
    margin: 0;
    padding: 20px;
    background: #f0f0f0;
}

.menu {
    margin-bottom: 20px;
}

button {
    padding: 10px 20px;
    margin-right: 10px;
    font-size: 16px;
    cursor: pointer;
}

canvas {
    background: white;
    border: 1px solid #ccc;
}