Use HeaderLabel size property

data/styles/ReleaseRow.scss

@@ -1,8 +1,3 @@
 release {
-    border-spacing: rem(6px);
     padding: 1em;
-
-    box.header {
-        border-spacing: rem(6px);
-    }
 }

src/Views/AppInfoView.vala

@@ -33,7 +33,6 @@ public class AppCenter.Views.AppInfoView : Adw.NavigationPage {
     private GLib.ListStore origin_liststore;
     private Gtk.CssProvider accent_provider;
     private Gtk.DropDown origin_dropdown;
-    private Gtk.Label app_subtitle;
     private Gtk.Overlay screenshot_overlay;
     private Adw.Carousel screenshot_carousel;
     private Adw.Clamp screenshot_not_found_clamp;
@@ -140,24 +139,10 @@ public class AppCenter.Views.AppInfoView : Adw.NavigationPage {
             package = package
         };
 
-        var app_title = new Gtk.Label (package.name) {
-            can_focus = false,
-            selectable = true,
-            wrap = true,
-            xalign = 0
-        };
-        app_title.add_css_class (Granite.STYLE_CLASS_H1_LABEL);
-
-        app_subtitle = new Gtk.Label (null) {
-            can_focus = false,
-            label = package.get_summary (),
-            selectable = true,
-            wrap = true,
-            wrap_mode = Pango.WrapMode.WORD_CHAR,
-            xalign = 0
+        var app_title = new Granite.HeaderLabel (package.name) {
+            secondary_text = package.get_summary (),
+            size = H1
         };
-        app_subtitle.add_css_class (Granite.STYLE_CLASS_H3_LABEL);
-        app_subtitle.add_css_class (Granite.CssClass.DIM);
 
         origin_liststore = new GLib.ListStore (typeof (AppCenterCore.Package));
 
@@ -184,8 +169,7 @@ public class AppCenter.Views.AppInfoView : Adw.NavigationPage {
             column_spacing = 12,
             valign = Gtk.Align.CENTER
         };
-        header_grid.attach (app_title, 0, 0);
-        header_grid.attach (app_subtitle, 0, 1, 2);
+        header_grid.attach (app_title, 0, 0, 1, 2);
         header_grid.attach (origin_dropdown, 0, 2, 2);
 
         if (!package.is_local) {

src/Views/CategoryView.vala

@@ -212,9 +212,10 @@ public class AppCenter.CategoryView : Adw.NavigationPage {
 
             if (label != null) {
                 var header = new Granite.HeaderLabel (label) {
-                    margin_start = 12
+                    margin_start = 12,
+                    size = H2
                 };
-                header.add_css_class (Granite.STYLE_CLASS_H2_LABEL);
+
                 append (header);
             }
             append (flowbox);

src/Widgets/ReleaseRow.vala

@@ -17,7 +17,7 @@
  * Authored by: Adam Bieńkowski <donadigos159@gmail.com>
  */
 
-public class AppCenter.Widgets.ReleaseRow : Gtk.Box {
+public class AppCenter.Widgets.ReleaseRow : Granite.Box {
     public AppStream.Release release { get; construct; }
 
     public ReleaseRow (AppStream.Release release) {
@@ -31,10 +31,9 @@ public class AppCenter.Widgets.ReleaseRow : Gtk.Box {
     construct {
         var header_icon = new Gtk.Image.from_icon_name ("tag-symbolic");
 
-        var header_label = new Gtk.Label (format_version (release.get_version ())) {
-            use_markup = true
+        var header_label = new Granite.HeaderLabel (format_version (release.get_version ())) {
+            size = H3
         };
-        header_label.add_css_class (Granite.STYLE_CLASS_H3_LABEL);
 
         var date_label = new Gtk.Label (format_date (release.get_timestamp ())) {
             halign = END,
@@ -50,12 +49,12 @@ public class AppCenter.Widgets.ReleaseRow : Gtk.Box {
             xalign = 0
         };
 
-        var header_box = new Gtk.Box (HORIZONTAL, 0);
-        header_box.add_css_class ("header");
+        var header_box = new Granite.Box (HORIZONTAL, HALF);
         header_box.append (header_icon);
         header_box.append (header_label);
         header_box.append (date_label);
 
+        child_spacing = HALF;
         orientation = VERTICAL;
         append (header_box);
         append (description_label);
@@ -100,7 +99,7 @@ public class AppCenter.Widgets.ReleaseRow : Gtk.Box {
 
     private string format_version (string version) {
         if (version != null) {
-            return "<b>%s</b>".printf (version);
+            return version;
         } else {
             return _("Unknown version");
         }