[gimp-help-2] Change equation backgrounds to gray for legibility

[Pat David <patdavid src gnome org>]

commit 2c5f5604286864509625bc21134d9bf0fa1037d8
Author: Pat David <patdavid gmail com>
Date:   Thu Jan 18 11:04:40 2018 -0600

    Change equation backgrounds to gray for legibility
    
    Equation PNGs are currently rendered as white.
    The new (web) background pages are white. :(
    
    This commit changes the background of web page equations to gray
    to increase legibility.

 stylesheets/gimp-help-screen.css |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/stylesheets/gimp-help-screen.css b/stylesheets/gimp-help-screen.css
index ea9ab2c..1ed6048 100644
--- a/stylesheets/gimp-help-screen.css
+++ b/stylesheets/gimp-help-screen.css
@@ -900,4 +900,15 @@ div.figure,div.table,div.informalfigure,div.informaltable,div.informalexample,di
 b.keycap,.keycap {
   -moz-border-radius: 0.3em;
 }
+
+/********************************************************
+/* Equation PNGs are white on a white background for 2.9
+/* Changing equation background to be a neutral gray for
+/* legibility.
+ * - patdavid
+/********************************************************/
+.equation-contents {
+    background-color: #aaa;
+    padding: 0.5rem;
+}
 }