diff --git a/YKanBan/Views/Board/BoardView.axaml b/YKanBan/Views/Board/BoardView.axaml
index 785abee..4187ce6 100644
--- a/YKanBan/Views/Board/BoardView.axaml
+++ b/YKanBan/Views/Board/BoardView.axaml
@@ -119,8 +119,8 @@
         </ScrollViewer>
 
         <TextBlock Grid.Row="1" Text="{x:Static lang:Resources.Board_NoColumns}"
-                   IsVisible="{Binding HasNoColumns}"
-                   HorizontalAlignment="Center" VerticalAlignment="Center" Opacity="0.6"/>
+                   IsVisible="{Binding HasNoColumns}" Classes="Secondary"
+                   HorizontalAlignment="Center" VerticalAlignment="Center"/>
 
     </Grid>
 </UserControl>
diff --git a/YKanBan/Views/Board/CardView.axaml b/YKanBan/Views/Board/CardView.axaml
index 61ec5bb..8e8e0c0 100644
--- a/YKanBan/Views/Board/CardView.axaml
+++ b/YKanBan/Views/Board/CardView.axaml
@@ -37,7 +37,7 @@
 
             <!-- Row 2: content preview. -->
             <TextBlock Grid.Row="1" Text="{Binding PreviewContent}" IsVisible="{Binding HasContent}"
-                       TextWrapping="Wrap" FontSize="12" Opacity="0.85" Margin="0,4,0,0"/>
+                       TextWrapping="Wrap" FontSize="12" Margin="0,4,0,0"/>
 
             <!-- Row 3: tag badges. -->
             <ItemsControl Grid.Row="2" ItemsSource="{Binding TagBadges}" IsVisible="{Binding HasTags}"
diff --git a/YKanBan/Views/Board/ColumnView.axaml b/YKanBan/Views/Board/ColumnView.axaml
index d1b4ebb..c24df68 100644
--- a/YKanBan/Views/Board/ColumnView.axaml
+++ b/YKanBan/Views/Board/ColumnView.axaml
@@ -20,7 +20,7 @@
                 <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="6" VerticalAlignment="Center">
                     <TextBlock Text="{Binding Title}" FontWeight="SemiBold"
                                TextTrimming="CharacterEllipsis" ToolTip.Tip="{Binding ToolTipText}"/>
-                    <TextBlock Text="{Binding CardCount}" Opacity="0.6" VerticalAlignment="Center"/>
+                    <TextBlock Text="{Binding CardCount}" Classes="Secondary" VerticalAlignment="Center"/>
                 </StackPanel>
 
                 <Button Grid.Column="1" Margin="4,0,0,0" Padding="4,2"
diff --git a/YKanBan/Views/Dialogs/CardEditorDialog.axaml b/YKanBan/Views/Dialogs/CardEditorDialog.axaml
index 6fa449b..c59188a 100644
--- a/YKanBan/Views/Dialogs/CardEditorDialog.axaml
+++ b/YKanBan/Views/Dialogs/CardEditorDialog.axaml
@@ -52,10 +52,10 @@
                 <Button Content="{x:Static lang:Resources.CardDialog_AddTag}"
                         Command="{Binding AddTagCommand}" HorizontalAlignment="Left"/>
 
-                <StackPanel Spacing="2" IsVisible="{Binding !IsNew}" Opacity="0.7" Margin="0,8,0,0">
-                    <TextBlock Text="{Binding IdLine}"/>
-                    <TextBlock Text="{Binding CreatedLine}"/>
-                    <TextBlock Text="{Binding ModifiedLine}"/>
+                <StackPanel Spacing="2" IsVisible="{Binding !IsNew}" Margin="0,8,0,0">
+                    <TextBlock Text="{Binding IdLine}" Classes="Secondary"/>
+                    <TextBlock Text="{Binding CreatedLine}" Classes="Secondary"/>
+                    <TextBlock Text="{Binding ModifiedLine}" Classes="Secondary"/>
                 </StackPanel>
 
                 <TextBlock Text="{Binding ErrorMessage}"
diff --git a/YKanBan/Views/Dialogs/MoveCardDialog.axaml b/YKanBan/Views/Dialogs/MoveCardDialog.axaml
index f0d08c9..4202777 100644
--- a/YKanBan/Views/Dialogs/MoveCardDialog.axaml
+++ b/YKanBan/Views/Dialogs/MoveCardDialog.axaml
@@ -25,7 +25,7 @@
                 </ComboBox.ItemTemplate>
             </ComboBox>
             <TextBlock Text="{x:Static lang:Resources.MoveDialog_NoTargets}"
-                       IsVisible="{Binding !CanMove}" Opacity="0.7" TextWrapping="Wrap"/>
+                       IsVisible="{Binding !CanMove}" Classes="Secondary" TextWrapping="Wrap"/>
         </StackPanel>
 
         <StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Right"
diff --git a/YKanBan/Views/Dialogs/SettingsDialog.axaml b/YKanBan/Views/Dialogs/SettingsDialog.axaml
index 31d1539..e9ce3d0 100644
--- a/YKanBan/Views/Dialogs/SettingsDialog.axaml
+++ b/YKanBan/Views/Dialogs/SettingsDialog.axaml
@@ -29,7 +29,7 @@
                 </ComboBox>
                 <TextBlock Text="{x:Static lang:Resources.Settings_Language_RestartNotice}"
                            IsVisible="{Binding RestartNoticeVisible}"
-                           FontStyle="Italic" Opacity="0.7"/>
+                           FontStyle="Italic" Classes="Secondary"/>
             </StackPanel>
 
             <StackPanel Spacing="4">
diff --git a/YKanBan/Views/Dialogs/TagPickerDialog.axaml b/YKanBan/Views/Dialogs/TagPickerDialog.axaml
index 40ba965..77dd3fa 100644
--- a/YKanBan/Views/Dialogs/TagPickerDialog.axaml
+++ b/YKanBan/Views/Dialogs/TagPickerDialog.axaml
@@ -28,7 +28,7 @@
                 </ComboBox.ItemTemplate>
             </ComboBox>
             <TextBlock Text="{x:Static lang:Resources.TagDialog_NoTargets}"
-                       IsVisible="{Binding !CanAdd}" Opacity="0.7" TextWrapping="Wrap"/>
+                       IsVisible="{Binding !CanAdd}" Classes="Secondary" TextWrapping="Wrap"/>
         </StackPanel>
 
         <StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Right"
diff --git a/YKanBan/Views/Tags/TagsView.axaml b/YKanBan/Views/Tags/TagsView.axaml
index 7038478..6fd7fbe 100644
--- a/YKanBan/Views/Tags/TagsView.axaml
+++ b/YKanBan/Views/Tags/TagsView.axaml
@@ -13,7 +13,7 @@
 
         <Grid Grid.Row="0" ColumnDefinitions="*,Auto" Margin="0,0,0,8">
             <TextBlock Grid.Column="0" Text="{Binding TagCountText}"
-                       VerticalAlignment="Center" Opacity="0.6" FontSize="13"/>
+                       VerticalAlignment="Center" Classes="Secondary" FontSize="13"/>
             <Button Grid.Column="1" Command="{Binding AddNewTagCommand}">
                 <StackPanel Orientation="Horizontal" Spacing="6">
                     <icons:PackIconLucide Kind="Plus" Width="16" Height="16"/>
@@ -36,8 +36,8 @@
                                 <StackPanel Grid.Column="1" Spacing="2">
                                     <TextBlock Text="{Binding Name}" FontWeight="SemiBold"/>
                                     <TextBlock Text="{Binding Description}" IsVisible="{Binding HasDescription}"
-                                               Opacity="0.7" FontSize="12" TextWrapping="Wrap"/>
-                                    <TextBlock Text="{Binding UsageText}" Opacity="0.6" FontSize="12"/>
+                                               Classes="Secondary" FontSize="12" TextWrapping="Wrap"/>
+                                    <TextBlock Text="{Binding UsageText}" Classes="Secondary" FontSize="12"/>
                                 </StackPanel>
 
                                 <Button Grid.Column="2" Command="{Binding EditCommand}" Padding="4,2" Margin="4,0"
@@ -58,8 +58,8 @@
         </ScrollViewer>
 
         <TextBlock Grid.Row="1" Text="{x:Static lang:Resources.Tags_Empty}"
-                   IsVisible="{Binding HasNoTags}"
-                   HorizontalAlignment="Center" VerticalAlignment="Center" Opacity="0.6"/>
+                   IsVisible="{Binding HasNoTags}" Classes="Secondary"
+                   HorizontalAlignment="Center" VerticalAlignment="Center"/>
 
     </Grid>
 </UserControl>
diff --git a/YKanBan/Views/WorkspaceView.axaml b/YKanBan/Views/WorkspaceView.axaml
index d75e811..c9e43a8 100644
--- a/YKanBan/Views/WorkspaceView.axaml
+++ b/YKanBan/Views/WorkspaceView.axaml
@@ -23,7 +23,7 @@
                 <StackPanel Grid.Column="0" Spacing="2" VerticalAlignment="Center">
                     <TextBlock Text="{Binding WorkspaceName}" FontSize="18" FontWeight="SemiBold"
                                TextTrimming="CharacterEllipsis"/>
-                    <TextBlock Text="{Binding WorkspacePath}" FontSize="12" Opacity="0.65"
+                    <TextBlock Text="{Binding WorkspacePath}" FontSize="12" Classes="Secondary"
                                TextTrimming="CharacterEllipsis"/>
                 </StackPanel>