Tooltip with scrollbar

* **C3 version**: 0.6.4
* **D3 version**: 4.13.0
* **Browser**: Chrome
* **OS**: Ubuntu

I have been stuck since a week trying to apply scollbar to the tooltip in c3 bar chart, However i was successful applying the scollbar but the scollbar isn't working. As soon as i hover over the bar/data i can see the scollbar but not scrolling. I am currently working in angular 8 with c3 chart package.
Here is my fiddle (Dont worry about the data as it is json or the array, I have the proper data. Just want the scroll to work):
As soon as I try to scroll, the cursor moves away from the bar and the tooltip fades away.

http://jsfiddle.net/qkrw62t9/1/