Update CSS for reference documentation.
Update CSS for reference documentation.

choptastic/nitrogen,kevinmontuori/nitrogen,joaohf/nitrogen,robsc/nitrogen,choptastic/nitrogen,nitrogen/nitrogen,stuart-thackray/nitrogen,choptastic/nitrogen,kevinmontuori/nitrogen,nitrogen/nitrogen,robsc/nitrogen,kaos/nitrogen,stuart-thackray/nitrogen,kaos/nitrogen,nitrogen/nitrogen,stuart-thackray/nitrogen,kevinmontuori/nitrogen,joaohf/nitrogen,joaohf/nitrogen