diff --git a/src/sass/gtk/_common-3.0.scss b/src/sass/gtk/_common-3.0.scss
index 94dfec7b..3b0b9359 100644
--- a/src/sass/gtk/_common-3.0.scss
+++ b/src/sass/gtk/_common-3.0.scss
@@ -1467,7 +1467,7 @@ actionbar {
   }
 }
 
-.background headerbar {
+headerbar {
   min-height: $headerbar_size;
   padding: 0 $container_padding + 10px;
   color: $header_fg;
diff --git a/src/sass/gtk/_drawing.scss b/src/sass/gtk/_drawing.scss
index 9bb9df8a..f69e464b 100644
--- a/src/sass/gtk/_drawing.scss
+++ b/src/sass/gtk/_drawing.scss
@@ -120,7 +120,7 @@
 
 // Buttons
 
-@mixin button($t, $actionb_bg:red, $actionb_fg: green) {
+@mixin button($t, $actionb_bg: red, $actionb_fg: green) {
 //
 // Button drawing function
 //