specifies a container for popover to be visible

Ref. #220

Author: usmonster

index.html

@@ -612,6 +612,7 @@ <h2 id="values">
                 title: function _getItemText() {
                     return this.textContent;
                 },
+                container: '.gantt',
                 content: "Here's some useful information.",
                 trigger: "hover",
                 placement: "auto right"