diff --git a/gtk-3.0/gtk-widgets.css b/gtk-3.0/gtk-widgets.css
index db6635d..d63ff55 100644
--- a/gtk-3.0/gtk-widgets.css
+++ b/gtk-3.0/gtk-widgets.css
@@ -57,11 +57,6 @@
     color: @theme_fg_color;
 }
 
-GtkClutterOffscreen {
-    background-color: @theme_bg_color;
-    color: @theme_fg_color;
-}
-
 *:selected,
 *:selected:focus {
     background-color: @theme_selected_bg_color;
@@ -2964,6 +2959,19 @@ GtkViewport.frame {
     padding: 4px;
 }
 
+/***********
+ * dialogs *
+ ***********/
+GtkMessageDialog,
+.prompt {
+    -GtkDialog-content-area-border: 0;
+    -GtkDialog-action-area-border: 0;
+    -GtkDialog-button-spacing: 0;
+
+    margin: 0;
+    padding: 0;
+}
+
 /*********************
  * app notifications *
  *********************/