pkg-config --modversion gtk+-3.0): 3.24.1
Hi, I guess you're enabling the "Built-in theme" option. Please try disabling it.

@nana-4 Is there a tweak I can add to the theme that shows raven with the default theme and not having that weird line?
@rolurq Yes.
If you have knowledge of SCSS, edit this line from 32px to 0 then run ./parse-sass.sh.
If you want to change the CSS directly, open the CSS and edit these four 32px to 0.
This is not the theme bug, and I won't (can't) add a workaround for the "Built-in theme".
So I would like to close this issue.
@nana-4 Thanks! I do have knowledge of SCSS, nevertheless your instructions are clear so I guess anyone could follow them.
Just curious, making such changes will break anything? Or change the intended behavior in other cases?
@FFY00 I made the changes to the theme, so far everything's ok. I guess @nana-4 will have more insights about this.
@FFY00 That margin is an area for Materia to draw Raven's box-shadow. That change only loses the shadow from Raven when you turn off the "Built-in theme" option.
Most helpful comment
@rolurq Yes.
If you have knowledge of SCSS, edit this line from
32pxto0then run./parse-sass.sh.If you want to change the CSS directly, open the CSS and edit these four
32pxto0.