add a button in alert message

app/assets/stylesheets/content/_notifications.lsg

@@ -21,6 +21,7 @@
             <li>Fact 2: You <em>really</em> made a mistake</li>
             <li>Fact 3: You <strong>should fix it</strong></li>
         </ul>
+        <button class="button">continue editing</button>
     </div>
 </div>
 ```

app/assets/stylesheets/content/_notifications.sass

@@ -74,11 +74,14 @@ $nm-color-warning-background: #f4f4aa
   position: relative
   word-wrap: break-word
 
+  & .button
+    margin: rem-calc(10px 10px 0 0)
+
   //@hack adapting to provided styles
   //messy I dont have all the details for a magic resolve, this might change
   & p, & ul
     margin-bottom: 0
-  & p, & ul>li
+  & p, & ul>li, & .button
     font-size: $nm-font-size
 
   &.-error