[BUG] Scroll bar appears for a short moment

[VARGA-Peter]

Describe the bug
The scroll bar appears in the browser window and disappears then. This causes that the browser has to re-render the content and therefore the content "flickers" for a very short moment.

To Reproduce
Steps to reproduce the behavior:
It is visible on pages which don't have too much content:

1. pages/examples/500
2. pages/examples/404
3. pages/examples/blank
   ...

Expected behavior
No scroll bar if the content fits completely into the browser window.

Screenshots
I added a very short video where the scroll bar is short visible when the page is reloaded with F5 and how it disappears when one of the above example URL is opened.

Environment (please complete the following information):

• AdminLTE Version: [2.4.5]
• Operating System: [Windows 10]
• Browser (Version): [Chrome (85.0.4183.121 (Official Build) (64-bit))]

ScrollBar.zip

[maiconpinto]

Hi @VARGA-Peter

I was can to reproduce the same effects, but I need investigate more, because I can't understand what's happening.