Data: https://www.gov.uk/government/statistical-data-sets/vehicle-licensing-statistics-data-tables https://www.kaggle.com/datasets/dorianlazar/uk-regions-geojson?resource=download
Style: https://stackoverflow.com/questions/54015895/altair-default-color-palette-colors-in-hex https://dev.to/dcodeyt/creating-beautiful-html-tables-with-css-428l
Folium colors: python-visualization/folium#403