hg: jdk9/sandbox: Add global css file.

[magnus.ihse.bursie at oracle.com]

Changeset: 28b5a1521478
Author:    ihse
Date:      2017-04-27 14:09 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/28b5a1521478

Add global css file.

! common/doc/building.html
! common/doc/testing.html
! common/doc/testing.md
! make/Javadoc.gmk
! make/UpdateBuildDocs.gmk