diff --git a/core/style.css b/core/style.css
index 3286039..cf2104f 100644
--- a/core/style.css
+++ b/core/style.css
@@ -27,6 +27,13 @@ nav.top::-webkit-scrollbar {
   display: none;
 }
 
+body:not(.filemanager):not(.guestbook) {
+	max-width: 1200px;
+	/* Define left/right individually to avoid breaking other margin styles */
+	margin-left: auto;
+	margin-right: auto;
+}
+
 body.home .home-container {}
 body.home .home-container img.logo { max-height: 256px; max-width: 100%; }
 body.home .home-container .slogan {