Fixed #1176

src/sass/_gtk-base.scss

@@ -6,3 +6,6 @@ $scheme: 'standard';
 
 // Gnome version
 $gnome_version: 'old';
+
+// Accent type
+$accent_type: 'default';

src/sass/gnome-shell/_common.scss

@@ -23,7 +23,7 @@ $cakeisalie: "This stylesheet is generated, DO NOT EDIT";
  * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-@if $gnome_version == 'new' {
+@if $gnome_version == 'new' and $accent_type == 'default' {
   $selected_bg_color: -st-accent-color;
   $primary_color: -st-accent-color;
 }

src/sass/gtk/_colors-libadwaita.scss

@@ -105,7 +105,7 @@ $dark_5: #000000;
 
 // The main accent color and the matching text value
 
-@if $gnome_version == 'old' {
+@if $gnome_version == 'old' or $accent_type == 'fixed' {
   @define-color accent_bg_color #{$primary_color};
   @define-color accent_fg_color #{$light_fg_color};
 }