change login button colour from blue to green

templates/rocky/_macros.html

@@ -160,7 +160,7 @@ href="{{ url_for('static', filename='mirrormanager2.css') }}"/>
             </div>
         </li>
         {% else %}
-        <a class="btn btn-primary ml-2" href="{{ url_for('auth.login') }}?next={{request.url}}">Login</a>
+        <a class="btn btn-primary btn-success ml-2" href="{{ url_for('auth.login') }}?next={{request.url}}">Login</a>
         {% endif %}
     </ul>
   </nav>