diff --git a/gtk/gtk-win32-base.css b/gtk/gtk-win32-base.css
index 59792a2f1f..160f84d7cb 100644
--- a/gtk/gtk-win32-base.css
+++ b/gtk/gtk-win32-base.css
@@ -81,6 +81,10 @@ GtkFrame {
   transition: 750ms linear lop;
 }
 
+.notebook > GtkScrolledWindow.frame {
+    border-style: none;
+}
+
 GtkScrolledWindow.frame {
   border-style: solid;
   border-width: 2px;