Minor CSS clean up.
Minor CSS clean up.

riuson/pannellum,Benvii/pannellum,riuson/pannellum,quentinyang/pannellum,quentinyang/pannellum,Benvii/pannellum,psteph801/psteph801.github.io,eric-seekas/pannellum,ywjrg/pannellum,eric-seekas/pannellum,ywjrg/pannellum,ywjrg/pannellum,quentinyang/pannellum,mpetroff/pannellum,mpetroff/pannellum,riuson/pannellum,quentinyang/pannellum,Benvii/pannellum,riuson/pannellum,mpetroff/pannellum,eric-seekas/pannellum,Benvii/pannellum,eric-seekas/pannellum,ywjrg/pannellum,mpetroff/pannellum,psteph801/psteph801.github.io,psteph801/psteph801.github.io,psteph801/psteph801.github.io