Leaflet: can I make the background map less opaque or more "faded"

I’m using leaflet to show a bunch of points on a US map.

I’m also connecting some of the points with lines.

As the user zooms in, these lines tend to blend in with things like roads and rivers and boundary lines.

I’m wondering if there’s a way to make the background map more transparent or hide some of the features - something that will give my extra lines more contrast against the map?

Thanks!

l
eafletContent = [
        dl.TileLayer(id="gitSandbox-tilelayer"), 
        dl.GeoJSON(
            data=dfGeo.__geo_interface__,
            cluster=doCluster,
            zoomToBoundsOnClick=True,  # when true, zooms to bounds of feature (e.g. cluster) on click
            superClusterOptions=dict(radius=MIN_MILES_FOR_CLUSTER),   # adjust cluster size,
            options=dict(pointToLayer=ns("draw_marker")),
        ),
    ]