Style clustered markers according to the design spec.
- Size: 32x32
- Same colors as nearby points
- Same hover, focus and selected effects as nearby points
Technical implementation
- Check options of the library https://github.com/Leaflet/Leaflet.markercluster and http://leaflet.github.io/Leaflet.markercluster/#customising-the-clustered-markers
- Possibly overwrite CSS only, we might be able to reuse what we did for the nearby markers: 829045: Style nearby markers as gray circles