Clearfix to not hide Add Node on small screens (fixes #659)

gui/index.html

@@ -165,6 +165,8 @@
           </div>
         </div>
         <button class="btn btn-sm btn-default pull-right" ng-click="addRepo()"><span class="glyphicon glyphicon-plus"></span>&emsp;<span translate>Add Repository</span></button>
+        <div class="clearfix"></div>
+        <hr class="visible-sm"/>
       </div>
 
       <!-- Node list (top right) -->
@@ -278,6 +280,7 @@
           </div>
         </div>
         <button class="btn btn-sm btn-default pull-right" ng-click="addNode()"><span class="glyphicon glyphicon-plus"></span>&emsp;<span translate>Add Node</span></button>
+        <div class="clearfix"></div>
       </div>
     </div> <!-- /row -->