canvas {
    border: 2px solid #009688;
    border-radius: 8px;
    touch-action: none;
    background: #fff;
}

.shapes .w3-bar {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.shapes button {
    transition: transform 0.2s;
}

.shapes button:hover {
    transform: scale(1.05);
}

.shapes h1 {
    margin: 20px 0;
    color: #333;
}