diff --git a/contrib/static/site.css b/contrib/static/site.css
index 59f670b..a6069a0 100644
--- a/contrib/static/site.css
+++ b/contrib/static/site.css
@@ -251,7 +251,7 @@ html {
 }
 
 #captcha_img {
-    background: grey;
+    background: #4DA6BD;
 }
 
 figure {