Fix notifications fragment for dark theme

app/src/main/res/layout/feed_card.xml

@@ -67,7 +67,9 @@
                         android:maxLines="1"
                         android:scrollHorizontally="true"
                         android:text="Subtitle"
-                        android:textSize="16sp" />
+                        android:textSize="16sp"
+                        android:textColor="@color/colorGray" />
+
                 </LinearLayout>
 
             </LinearLayout>

app/src/main/res/layout/fragment_notifications.xml

@@ -2,7 +2,8 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="app.insti.fragment.NotificationsFragment">
+    tools:context="app.insti.fragment.NotificationsFragment"
+    android:background="?attr/themeColor">
 
     <android.support.v7.widget.RecyclerView
         android:id="@+id/notifications_recycler_view"