diff --git a/config/themes/modern/theme.css b/config/themes/modern/theme.css
index c5cfab5..d6c5671 100644
--- a/config/themes/modern/theme.css
+++ b/config/themes/modern/theme.css
@@ -50,7 +50,7 @@ img, tag {
 
     .hero-background {
         max-width: 90%;
-        margin: auto;
+        margin: 0 auto;
     }
 
     .back-button {