Add tags

docs/documentation/elements/notification.html

@@ -2,6 +2,13 @@
 layout: documentation
 doc-tab: elements
 doc-subtab: notification
+variables:
+- name: $notification-background-color
+  value: $background
+- name: $notification-radius
+  value: $radius
+- name: $notification-padding
+  value: 1.25rem 2.5rem 1.25rem 1.5rem
 ---
 
 {% include subnav-elements.html %}
@@ -88,5 +95,8 @@ doc-subtab: notification
 {% endhighlight %}
       </div>
     </div>
+
+    {% include variables.html %}
+
   </div>
 </section>