diff --git a/userChrome.css b/userChrome.css
index 33d39b5..67e75a1 100644
--- a/userChrome.css
+++ b/userChrome.css
@@ -566,6 +566,7 @@
     #unknownContentType {
       color: var(--in-content-page-color) !important;
       background-color: var(--in-content-page-background) !important;
+      border-radius: 0 0 8px 8px !important;
     }
 
     /*- Button ---------------------------------------------------------------*/