Vertical Scroll bar visibility

Hello All,

I Created react Virtualized table with fixed header and multi select table with required width using react-table.

when the rows are increasing the table vertical scroll is not showing properly

https://codesandbox.io/s/inspiring-cloud-6j1e5?file=/src/App.js

I try to overcome this issue(#495)

but issue is not solved.

How to solve this issue
Thank you