.canvas-container {
    position: relative;
    max-width: 100%;
    height: auto;
    border: 2px solid #e5e7eb;
    background-color: #f3f4f6;
    border-radius: 0.5rem;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

#imageCanvas {
    max-width: 100%;
    height: auto;
    display: block;
}

.btn-shape {
    background-color: #e5e7eb;
    color: #374151;
    font-weight: 600;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background-color 0.2s;
}

.btn-shape:hover {
    background-color: #d1d5db;
}