Add image styles for the dithering study.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/web/trunk@3638 92316355-f0b4-4df1-b90c-862c8a59935f

trac/htdocs/main.css

@@ -52,3 +52,18 @@ p {
 #footer {
   display: none;
 }
+
+/* Styles for images in documentation and articles */
+
+img.math {
+  vertical-align: middle;
+  margin-left: 10px;
+  margin-right: 10px;
+}
+
+img.matrix {
+  vertical-align: top;
+  margin-right: 30px;
+  margin-top: 10px;
+}
+