diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2966f600..ac379e73 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -212,4 +212,3 @@ add_subdirectory(po)
 add_subdirectory(sql)
 add_subdirectory(ui)
 add_subdirectory(src)
-add_subdirectory(theming)
diff --git a/src/client/application/geary-application.vala b/src/client/application/geary-application.vala
index e5978994..4419bbaf 100644
--- a/src/client/application/geary-application.vala
+++ b/src/client/application/geary-application.vala
@@ -295,23 +295,16 @@ public class GearyApplication : Gtk.Application {
         return builder;
     }
 
-    public string? read_theme_file(string filename) {
-        try {
-            File file = get_resource_directory().get_child("theming").get_child(filename);
-            DataInputStream data_input_stream = new DataInputStream(file.read());
-            
-            size_t length;
-            return data_input_stream.read_upto("\0", 1, out length);
-        } catch(Error error) {
-            debug("Unable to load text from theme file: %s", error.message);
-            return null;
-        }
+    public string read_resource(string name) throws Error {
+        InputStream input_stream = resources_open_stream(
+            "/org/gnome/Geary/" + name,
+            ResourceLookupFlags.NONE
+        );
+        DataInputStream data_stream = new DataInputStream(input_stream);
+        size_t length;
+        return data_stream.read_upto("\0", 1, out length);
     }
-    
-    public File get_ui_file(string filename) {
-        return get_resource_directory().get_child("ui").get_child(filename);
-    }
-    
+
     // Loads a UI GResource into the specified UI manager.
     public void load_ui_resource_for_manager(Gtk.UIManager ui, string name) {
         try {
diff --git a/src/client/conversation-viewer/conversation-web-view.vala b/src/client/conversation-viewer/conversation-web-view.vala
index f969af94..06d407c2 100644
--- a/src/client/conversation-viewer/conversation-web-view.vala
+++ b/src/client/conversation-viewer/conversation-web-view.vala
@@ -69,7 +69,7 @@ public class ConversationWebView : StylishWebView {
 
     // Overridden since WebKitGTK+ 2.4.10 at least doesn't want to
     // report a useful height. In combination with the rules from
-    // theming/message-viewer.css we can get an accurate idea of
+    // ui/conversation-web-view.css we can get an accurate idea of
     // the actual height of the content from the BODY element, but
     // only once loaded.
     public override void get_preferred_height(out int minimum_height,
@@ -134,14 +134,14 @@ public class ConversationWebView : StylishWebView {
             WebKit.DOM.Document document = get_dom_document();
             WebKit.DOM.Element style_element = document.create_element(STYLE_NAME);
             
-            string css_text = GearyApplication.instance.read_theme_file("message-viewer.css") ?? "";
+            string css_text = GearyApplication.instance.read_resource("conversation-web-view.css");
             WebKit.DOM.Text text_node = document.create_text_node(css_text);
             style_element.append_child(text_node);
             
             WebKit.DOM.HTMLHeadElement head_element = document.get_head();
             head_element.append_child(style_element);
         } catch (Error error) {
-            debug("Unable to load message-viewer document from files: %s", error.message);
+            debug("Error loading conversation-web-view.css: %s", error.message);
         }
         
         on_document_font_changed();
diff --git a/theming/CMakeLists.txt b/theming/CMakeLists.txt
deleted file mode 100644
index d5b3a131..00000000
--- a/theming/CMakeLists.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-set(THEMING_DEST share/geary/theming)
-
-install(FILES message-viewer.html DESTINATION ${THEMING_DEST})
-install(FILES message-viewer.css DESTINATION ${THEMING_DEST})
diff --git a/ui/CMakeLists.txt b/ui/CMakeLists.txt
index 35223dad..3106cbce 100644
--- a/ui/CMakeLists.txt
+++ b/ui/CMakeLists.txt
@@ -12,6 +12,7 @@ set(RESOURCE_LIST
   STRIPBLANKS "conversation-message.ui"
   STRIPBLANKS "conversation-message-menu.ui"
   STRIPBLANKS "conversation-viewer.ui"
+              "conversation-web-view.css"
   STRIPBLANKS "edit_alternate_emails.glade"
   STRIPBLANKS "find_bar.glade"
   STRIPBLANKS "folder-popover.ui"
diff --git a/theming/message-viewer.css b/ui/conversation-web-view.css
similarity index 100%
rename from theming/message-viewer.css
rename to ui/conversation-web-view.css