[Joomla 4.4. and 5.0.3] Bug with Modal block Guide tours

[JoomlaBelarus]

Steps to reproduce the issue

Go to User Menu in Backend Top Right corner, open Accesibility settings. Set High Contrast as YES.
Then go to button Take a tour at the top of window, set same tours, for example How to create article.

Expected result

Modal block with Name of tour , description, and next button is UNDER svf gray block on the page, not on the center of visible window.

Actual result

System information (as much as possible)

joomla 4.4, joomla 5.0.3

Additional comments

I think problem with classes in the body tag - You need delete a11y_contrast class - and that block come back to the center. body.a11y_contrast {
filter: contrast(115%);
}
May be problem at this class?

[JoomlaBelarus]

And add, the same problem is not only with high contrast, but with monochrome too.
We need delete class monochrome and a11y_contrast from body tag and add it to a

with modal tour
<div aria-describedby="tourinfo-description" aria-labelledby="tourinfo-label" role="dialog" tabindex="0" class="shepherd-has-cancel-icon shepherd-has-title shepherd-element shepherd-theme-arrows monochrome shepherd-centered shepherd-enabled" data-shepherd-step-id="tourinfo" data-popper-placement="bottom" style="position: fixed; left: 50%; top: 50%; transform: translate(-50%, -50%);">

I add some link with problem here - https://stackoverflow.com/questions/52937708/why-does-applying-a-css-filter-on-the-parent-break-the-child-positioning