.droppable {
    width: 90%;
    height: 300px;
    border: 2px dashed #ccc;
    margin: 10px;
    position: relative;
    transition: background-color 0.3s ease;
}

.droppable.dragging {
    background-color: #f0f0f0;
}

.droppable img {
    max-width: 100%;
    max-height: 100%;
}