Match outline heading colors in colorful headings mode

[JigenDD]

Considering that the right sidebar in the Minimal theme is the same background color as the page, it is my understanding that the devs want to convey that it is a part of the working area, and an extension of the main page. However, one feature which I have always found lacking is the fact the outline uses such muted colors and a small font to identify headings. In longer notes, it gets way too convoluted to navigate

I would like to have the Minimal theme have an option for the outline to inherit the same colors (and possibly fonts, scaled down to a smaller size) of the colored headings we see on the page. That way the visual identification of headings and sections becomes much snappier.

I found this piece of custom CSS in Sascha D. Kasper's YouTube channel which I found very useful and I've further expanded/customized (in a very amateur-ish way, with the hover underline of the outline no longer working at 100%), in order to output these different sized/colored outline headings, using the same custom fonts I had attributed to the headings in content page. The result is as follows:

Personally I find this like such a natural addition to Minimal's possibilities (and something rather, huh, "minimal", in terms of offering increasing visual coherence) that I could not help but leave the suggestion here: A native implementation of this (in style settings or minimal's settings plugin) where the user would just press and on/off button in order for the outline to inherit the font, size (in a scaled down fashion) and color of its headings.