diff --git a/assets/less/mio/main.less b/assets/less/mio/main.less
index cabe4c7c..5576c689 100644
--- a/assets/less/mio/main.less
+++ b/assets/less/mio/main.less
@@ -11,7 +11,7 @@
 
 :root {
     --site-max-width: @site-max-width;
-    --site-background-meta: no-repeat center / cover;
+    --site-background-meta: no-repeat center / cover fixed;
     --site-background-image: initial;
 
     --accent-colour: @default-accent-colour;