diff --git a/mercurial/templates/static/style-coal.css b/mercurial/templates/static/style-coal.css
--- a/mercurial/templates/static/style-coal.css
+++ b/mercurial/templates/static/style-coal.css
@@ -221,6 +221,8 @@ div.description {
   border-left: 3px solid #999;
   margin: 1em 0 1em 0;
   padding: .3em;
+  white-space: pre;
+  font-family: monospace;
 }
 
 /* Graph */