Fix up CSS from topbar removal.
Fix up CSS from topbar removal.

Additionally, removed excess/unnecessary attributes to make it as lean
as possible. Tested on Firefox and Chromium.

10gen-labs/mongo-web-shell,FuegoFro/mongo-web-shell,rcchan/mongo-web-shell,mongodb-labs/mongo-web-shell,rcchan/mongo-web-shell,mcomella/mongo-web-shell,rcchan/mongo-web-shell,mongodb-labs/mongo-web-shell,lnickers2004/mongo-web-shell,lnickers2004/mongo-web-shell,lnickers2004/mongo-web-shell,mcomella/mongo-web-shell,mongodb-labs/mongo-web-shell,10gen-labs/mongo-web-shell,FuegoFro/mongo-web-shell,ecbtln/mongo-web-shell,pilliq/mongo-web-shell,pilliq/mongo-web-shell,mcomella/mongo-web-shell,ecbtln/mongo-web-shell,FuegoFro/mongo-web-shell,pilliq/mongo-web-shell,ecbtln/mongo-web-shell,lnickers2004/mongo-web-shell,10gen-labs/mongo-web-shell