Fixed html element nesting issue

Author: jcha40

index.html

@@ -63,10 +63,11 @@
                             <input type="button" id="reset-plot-button" value="Reset plot">
                             <script src="js/events/reset_button.js"></script>
                             <div style="display: block; margin-top: 5px;">
-                                <label for="enable-tooltips" id="enable-tooltips-label">Enable tooltips</label>
+                                <label for="enable-tooltips-checkbox" id="enable-tooltips-label">Enable tooltips</label>
                                 <input id="enable-tooltips-checkbox" type="checkbox">
                                 <script src="js/tooltips.js"></script>
                             </div>
+                        </div>
                     </div>
                 </div>
             </div>