They don't use ESRI's COTS ( dashboard, experience builder, web appbuilder)
No nonsense ESRI button, no nonsense ESRI widget
They use mapbox.
https://data.trackingcalifornia.org/?area=ncdm_bd&event=TR21&type=PR10K&sex=TOTL&age=TOTL&race=TOTL&year=20132017&co=