contao-leaflet-libraries/assets/leaflet-layer-overpass/OverPassLayer.css

.leaflet-control-minZoomIndicator {
    font-size: 2em;
    background: #ffffff;
    background-color: rgba(255,255,255,0.7);
    border-radius: 10px;
    padding: 1px 15px;
    opacity: 0.5;   
}