diff --git a/src/sass/_colors.scss b/src/sass/_colors.scss
index 19faa31b..b0e10694 100644
--- a/src/sass/_colors.scss
+++ b/src/sass/_colors.scss
@@ -146,7 +146,7 @@ $header_fg:                         if($variant == 'light', #575757, #FDFDFD);
 $dark_header_bg:                    if($trans == 'true', gtkalpha($base_color, 0.96), $base_color);
 $header_bg_backdrop:                if($variant == 'light', gtkmix(black, $header_bg, 2%), gtkmix(black, $header_bg, 1%));
 $header_border:                     if($variant == 'light', gtkmix(black, $header_bg, 12%), gtkmix(black, $header_bg, 75%));
-$header_border_backdrop:            if($variant == 'light', gtkmix(black, $header_bg, 8%), gtkmix(black, $header_bg, 35%));
+$header_border_backdrop:            if($variant == 'light', gtkmix(black, $header_bg, 8%), gtkmix(black, $header_bg, 45%));
 
 // Sidebar colors
 $dark_sidebar_bg: white;
diff --git a/src/sass/gtk/_colors-libadwaita.scss b/src/sass/gtk/_colors-libadwaita.scss
index 43a58dea..820b430c 100644
--- a/src/sass/gtk/_colors-libadwaita.scss
+++ b/src/sass/gtk/_colors-libadwaita.scss
@@ -268,6 +268,7 @@ $dark_5: #000000;
   $header_fg: gtkcolor(headerbar_fg_color);
   $header_border: gtkcolor(headerbar_darker_shade_color);
   $header_bg_backdrop: gtkcolor(headerbar_backdrop_color);
+  $header_border_backdrop: gtkcolor(headerbar_shade_color);
 
   $dialog_bg_color: gtkcolor(dialog_bg_color);
   $dialog_fg_color: gtkcolor(dialog_fg_color);
@@ -283,4 +284,10 @@ $dark_5: #000000;
   $wm_shadow_backdrop: gtkcolor(sidebar_shade_color);
   $wm_outline: 0 0 0 2px rgba(black, 0.03), 0 0 0 1px gtkcolor(headerbar_darker_shade_color);
   $wm_border: gtkcolor(headerbar_darker_shade_color);
+
+  @if $trans=='true' {
+    $bg_color: color-mix(in srgb, gtkcolor(window_bg_color) 95%, transparent);
+    $dark_sidebar_bg: color-mix(in srgb, gtkcolor(sidebar_bg_color) 95%, transparent);
+    $menu_bg: color-mix(in srgb, gtkcolor(popover_bg_color) 95%, transparent);
+  }
 }
diff --git a/src/sass/gtk/_colors-public.scss b/src/sass/gtk/_colors-public.scss
index c8e5043f..718fc7b1 100644
--- a/src/sass/gtk/_colors-public.scss
+++ b/src/sass/gtk/_colors-public.scss
@@ -17,14 +17,14 @@ $theme_text: currentColor;
 @define-color base_color #{"" + $base_color};
 @define-color selected_bg_color #{"" + $selected_bg_color};
 @define-color selected_fg_color #{"" + $selected_fg_color};
-@define-color insensitive_bg_color #{"" + color-mix(in srgb, $bg_color 60%, $base_color)};
+@define-color insensitive_bg_color #{"" + gtkmix($bg_color, $base_color, 60%)};
 @define-color insensitive_fg_color #{"" + $disabled_fg_color};
 @define-color insensitive_base_color #{"" + $base_color};
 @define-color theme_unfocused_fg_color #{"" + $fg_color};
 @define-color theme_unfocused_text_color #{"" + $theme_text};
 @define-color theme_unfocused_bg_color #{"" + $bg_color};
 @define-color theme_unfocused_base_color #{"" + $base_color};
-@define-color unfocused_insensitive_color #{"" + color-mix(in srgb, $fg_color 35%, $bg_color)};
+@define-color unfocused_insensitive_color #{"" + gtkmix($fg_color, $bg_color, 35%)};
 @define-color borders #{"" + $borders_color};
 @define-color unfocused_borders #{"" + $borders_color};
 
diff --git a/src/sass/gtk/_common-4.0.scss b/src/sass/gtk/_common-4.0.scss
index 7ec02bb9..1c7c591f 100644
--- a/src/sass/gtk/_common-4.0.scss
+++ b/src/sass/gtk/_common-4.0.scss
@@ -4817,10 +4817,8 @@ calendar {
 // Dialogs
 //
 
-$messagedialog_bg: if($trans == 'true', gtkalpha($bg_color, 0.95), $bg_color);
-
 window.dialog.message { // Message Dialog styling
-  &.background { background-color: $messagedialog_bg; }
+  &.background { background-color: $dialog_bg_color; }
 
   .titlebar {
     min-height: 28px;
@@ -5003,7 +5001,7 @@ stacksidebar {
 
 // Navigation Sidebar
 .navigation-sidebar {
-  background-color: $dark_sidebar_bg;
+  background-color: transparent;
   padding: $container_padding; //only vertical padding. horizontal row size would clip
 
   > separator {
diff --git a/src/sass/gtk/apps/_libadwaita.scss b/src/sass/gtk/apps/_libadwaita.scss
index 180c1e26..4a0f1553 100644
--- a/src/sass/gtk/apps/_libadwaita.scss
+++ b/src/sass/gtk/apps/_libadwaita.scss
@@ -586,11 +586,11 @@ toolbarview.undershoot-bottom scrolledwindow {
 .unfolded stacksidebar.sidebar { border: none; }
 
 .sidebar-pane {
-  background-color: $dark_sidebar_bg;
+  background-color: transparent;
   color: $dark_sidebar_fg;
 
   &:backdrop {
-    background-color: $dark_sidebar_bg;
+    background-color: transparent;
     // transition: background-color $longer_duration $deceleration_curve;
   }