I haven’t messed with it. It’s not an editor. It’s a way to package changes to css you make into an Addon. And maybe give some starting points on where to start editing the css.
To do the actual editing you’d use your browser. Open up the dev console and then you can fiddle around with the css. I guess that’s not really coding. In chrome at least you can click on any element and it will jump to that portion in the css where you can change the color and such. That theme sdk probably makes it easier by letting you change some color variables that is used all over. Anyways that’s my impression at least from skimming that page.
You could also try some dark mode browser addons. It may work. No idea. I’m not that into it. The most I’ve messed with css is to get rid of the pink text on the forums. Otherwise I stay away from it.
Doesn’t construct come with a dark theme though?
Yes Rojo, the dark theme comes default but it was not modern & flat. But I think I found what I want.
So with a quick research, I've noticed a theme with my demands, named "One Dark". Link: construct.net/en/make-games/addons/545/one-dark-theme
The reason make me confused is it's located in addons page instead themes page. It might be because they don't want to have anything free in the themes section. Link: construct.net/en/game-assets/themes
The problem seems to be solved, but my question still remains valid. I would love to play with CSS with a tool like YellowPencil. :) If anyone knows such a tool, I would be very happy.