diff --git a/README.md b/README.md
index f79ed207c4b7bf096aa6a6e38901f754fc7665fa..45fa8b3b9fd239b9e9bab82fe5afdd03f20d8dfe 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,10 @@
 # firefox-chrome
-chrome directory for firefox
 
+chrome directory for firefox to override bad CSS
+
+## References
+
+- [1] http://superuser.com/questions/318912/how-to-override-the-css-of-a-site-in-firefox-with-usercontent-css
+- [2] https://ffeathers.wordpress.com/2013/03/10/how-to-override-css-stylesheets-in-firefox/
+- [3] http://stackoverflow.com/questions/1461077/how-do-i-remove-background-image-in-css
+- [4] http://thebarnharts.com/firefoxcssoverride.asp
diff --git a/userContent.css b/userContent.css
index cd1e9f778a98705c5dabf91cdde8a867957b9ba5..51139a365b63e89d553e6d53a9dfbc4d6dc4d063 100644
--- a/userContent.css
+++ b/userContent.css
@@ -84,3 +84,8 @@
     width: calc(100% - 220px) !important; /* 220px is nav bar with style #inner-left */
   }
 }
+
+@-moz-document domain(www.p-m-a.atx.at) {
+/* bad colour contrast */
+  body{ background-color: #FFFFFF !important; background: none; }
+}