diff --git a/docs/index.css b/docs/index.css
index aea10f6..077767d 100644
--- a/docs/index.css
+++ b/docs/index.css
@@ -12,6 +12,7 @@ body {
   background-image: url("images/galaxy.png");
   background-size: cover;
   background-position: 0 -170px;
+  background-attachment: fixed;
   text-align: center;
   color: white;
   padding: 50px 0;