cleaning up syntax of CSS files in www/common/css

Not cleaning up www/common/css/docblitz.css. Already addressed
in I0b6ab58d7887c1df3b5e52937c6f6902fa995f97.

Change-Id: Iec2e607d8423584069d3d4374a643305ce10aafb
Merge "cleaning up syntax of CSS files in www/common/css"