Which CSS (cascading style sheet) influences the overall appearance of a dashboard’s main content area, including background color of dashboard page and page tab color?

Which CSS (cascading style sheet) influences the overall appearance of a dashboard’s main content area, including background color of dashboard page and page tab color?

A.
PortalBanner.css

B.
Views.css

C.
PortalContent.css

D.
DashboardBanner.css