diff --git a/gtk-3.0/gtk-widgets.css b/gtk-3.0/gtk-widgets.css
index addc997..79aaacb 100644
--- a/gtk-3.0/gtk-widgets.css
+++ b/gtk-3.0/gtk-widgets.css
@@ -304,6 +304,7 @@ GtkAssistant .sidebar {
     border-color: transparent;
     background-color: transparent;
     background-image: none;
+    box-shadow: none;
 }
 
 /****************
@@ -604,7 +605,10 @@ GtkExpander {
     border-radius: 0;
 }
 
-.frame.flat { border: none; }
+.frame.flat {
+    border: none;
+    box-shadow: none;
+}
 
 /*******************
  * scrolled window *
@@ -2389,6 +2393,7 @@ GtkColorButton.button {
     border-color: transparent;
     background-color: transparent;
     background-image: none;
+    box-shadow: none;
 }
 
 .primary-toolbar .raised .button,