The scrollbar appearance on different is not consisted across differ OS

Issue Summary

The scrollbar on the new Jira issue view varies with different OS platforms. While in mac it appears when we start scrolling the page and disappear when no activity on the page. In Windows, there are 4 scrollbars that are always visible and this gives an unpleasant look in the UI.

Also, multiple scrollbars appear when we are using any external mouse.

Steps to Reproduce

1. Open any issue key on the Windows Platform
2. Or, add an external mouse in mac the number of scrolls will always be 4

Expected Results

Scrollbars should be consistent across any platform.

Actual Results

Here are the actual scrollbars that appear on the windows UI.

Workaround

Disable automatic scrollbars for Windows