Update index.html

index.html

@@ -174,6 +174,7 @@ <h2>Select data types: </h2>
             <div id="gsp-plot"></div>
         </div>
     </div>
+    <button id="values-pane-btn" class="open_values mapboxgl-ctrl mapboxgl-ctrl-group"></button>
     <div id="control-panel" class="sidebar">
         <a href="javascript:void(0)" class="closebtn">×</a>        
         <div class="panel-group" id="accordion">