.layers-container {
    position: relative;
    width: 800px;
    height: 600px;
    margin: 0 auto;
    border: 1px solid #ccc;
}

.layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: opacity 0.5s ease;
}

.layer img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.layer-controls {
    text-align: center;
    margin: 20px 0;
}

.layer-checkbox {
    margin: 0 10px;
}