Fixed #201

src/sass/libadwaita/_colors.scss

@@ -106,8 +106,8 @@ $trough_active_color: gtkalpha(currentColor, .25);
 $fill_color: $accent_bg_color;
 $fill_text_color: $accent_fg_color;
 
-$slider_color: $headerbar_bg_color;
-$slider_hover_color: $headerbar_backdrop_color;
+$slider_color: $view_bg_color;
+$slider_hover_color: $window_bg_color;
 
 $osd_fg_color: transparentize(white, .1);
 $osd_text_color: white;

src/sass/libadwaita/widgets/_message-dialog.scss

@@ -77,7 +77,53 @@ window.dialog-window.alert {
   }
 }
 
-window.messagedialog,
+window.messagedialog {
+  .message-area {
+    padding-top: $medium_size - 4px;
+    padding-bottom: $base_padding * 2;
+    border-spacing: $small_size;
+
+    &.has-heading.has-body {
+      border-spacing: $base_padding + 4px;
+
+      > .child {
+        margin-top: $base_padding + 2px;
+      }
+    }
+
+    > .heading-bin, > .body, > .child {
+      padding-left: $small_size;
+      padding-right: $small_size;
+    }
+  }
+
+  .response-area {
+    padding: $base_padding;
+    border-spacing: $base_padding;
+
+    > button {
+      min-height: $small_size;
+      min-width: $large_size + 12px;
+      padding: $base_padding + 2px $base_padding + 8px;
+      border-radius: $button_radius;
+      margin: 0;
+
+      &.suggested {
+        color: $accent_color;
+      }
+  
+      &.destructive {
+        color: $destructive_color;
+      }
+    }
+
+    > separator {
+      background: none;
+      margin: $base_padding / 2;
+    }
+  }
+}
+
 dialog.alert.floating {
   .message-area {
     padding-top: $medium_size - 4px;
@@ -106,7 +152,7 @@ dialog.alert.floating {
     > button {
       min-height: $small_size;
       min-width: $large_size + 12px;
-      padding: $base_padding + 4px $base_padding + 8px;
+      padding: $base_padding + 2px $base_padding + 8px;
       border-radius: $button_radius;
       margin: 0;
 

src/sass/libadwaita/widgets/_sidebars.scss

@@ -16,7 +16,7 @@
 
   @if $colorscheme != 'default' or $blackness == 'true' or $colortype == 'fixed' {
     listview,
-    list,
+    list:not(.navigation-sidebar),
     list.boxed-list {
       background-color: gtkmix(white, $sidebar_bg_color, 5%);
       color: $sidebar_fg_color;
@@ -285,6 +285,23 @@ stacksidebar row {
         }
       }
     }
+
+    tabbar {
+      .box {
+        color: $window_fg_color;
+      }
+
+      tab {
+        color: $window_fg_color;
+
+        &:selected {
+          color: $window_fg_color;
+        }
+
+        &:hover { color: $window_fg_color; }
+        &:active { color: $window_fg_color; }
+      }
+    }
   }
 }