Cleanup CSS for side-by-side view when there are character differences

We no longer have gaps, but instead have a nice contiguous
coloring region.  The visual difference is night-and-day.

Change-Id: I3e80a5860e62472713424dece49a018d584b3b65
Signed-off-by: Shawn O. Pearce <sop@google.com>
4 files changed