Simplified included css styles; refining some overrides.
Simplified included css styles; refining some overrides.

nntisapeh/intro_programming,BadWizard/intro_programming,ehmatthes/intro_programming,nntisapeh/intro_programming,nntisapeh/intro_programming,ehmatthes/intro_programming,nntisapeh/intro_programming,BadWizard/intro_programming,BadWizard/intro_programming,ehmatthes/intro_programming,BadWizard/intro_programming,ehmatthes/intro_programming