added header custom style
added header custom style

EnviDat/ckanext-envidat_theme,EnviDat/ckanext-envidat_theme,espona/ckanext-envidat_theme,EnviDat/ckanext-envidat_theme,EnviDat/ckanext-envidat_theme,espona/ckanext-envidat_theme,espona/ckanext-envidat_theme