diff --git a/src/css/preprod.css b/src/css/preprod.css
index cde0149e..5f38092e 100644
--- a/src/css/preprod.css
+++ b/src/css/preprod.css
@@ -1,3 +1,3 @@
 body {
-  background: url('../image/preprod') no-repeat center;
+  background: url('../image/preprod') no-repeat center fixed;
 }