#data_map {
    z-index: 99;
}

.regional-frame {
    position: absolute;
    inset: 0;          /* top/left/right/bottom = 0 */
    width: 100%;
    height: 100%;
    border: none;
}

.regional-frame.hidden {
    opacity: 0;
    pointer-events: none;
}

.regional-frame.visible {
    opacity: 1;
    pointer-events: auto;
}