Hi,
Out of the box all works well and looks good. All plain and simple.
It showed on previous old theme and others I tried out.

When I do an inspect, it shows in the markup stuff, and is suppose to be white on black, but nothing is displaying. Tried highlighting to check, but it’s not there.

Thanks for letting me know what might cause that. Nice plain reversed theme – they are VERY rare now without all the garbage and millions of photo areas.

I am using the Myth Theme and created a Child Theme the old-fashioned way, with a custom style.css file using @import for the parent CSS. The Mobile Menu works on the Parent Theme, but in the Child Theme, when you click on “Menu” the background changes color to show it’s activated, but the Mobile Menu just does not appear. Tested on Chrome for Android, Safari on iOS, and Safari on Mac.