diff --git a/contrib/static/site.css b/contrib/static/site.css
index 3bcd52f..9b31138 100644
--- a/contrib/static/site.css
+++ b/contrib/static/site.css
@@ -108,6 +108,7 @@ html {
     color: #ededed;
     background: #695D81 url("/static/bg.jpg");
     height: 100%;
+    background-attachment: fixed;
     background-blend-mode: overlay;
     background-size: 100% 100%;
     font-family: arial,helvetica,sans-serif;