.drag-area {
    position: relative;
}

.dragging-overlay {
    position: absolute;
    top: 0; bottom: 0; right: 0; left: 0;

    display: flex;
    justify-content: center;
    align-items: center;

    border: 4px dotted lightblue;
    color: lightblue;
    font-size: 2em;
    border-radius: 16px;
}

.dragging-baselayer {
    opacity: 1;
    transition: opacity 0.2s;
}

.dragging .dragging-baselayer {
    opacity: 0.1;
}