Summary
-------
* Do not edit the CSS directly, edit the source SCSS files and the CSS files will be generated
automatically when building with meson + ninja and left inside the build directory to be
incorporated into the gresource XML (you'll need to have sassc installed).
How to tweak the theme
----------------------
Adwaita is a complex theme, so to keep it maintainable it's written and processed in SASS, the
generated CSS is then transformed into a gresource file during gtk build and used at runtime in a
non-legible or editable form.
It is very likely your change will happen in the _common.scss file. That's where all the widget
selectors are defined. Here's a rundown of the "supporting" stylesheets, that are unlikely to be the
right place for a drive by stylesheet fix:
_colors.scss - global color definitions. We keep the number of defined colors to a necessary minimum,
most colors are derived from a handful of basics. It is an exact copy of the gtk+
counterpart. Light theme is used for the classic theme and dark is for GNOME3 shell
default.
_drawing.scss - drawing helper mixings/functions to allow easier definition of widget drawing under
specific context. This is why Adwaita isn't 15000 LOC.
_common.scss - actual definitions of style for each widget. This is where you are likely to add/remove
your changes.
You can read about SASS at http://sass-lang.com/documentation/. Once you make your changes to the
_common.scss file, you can run ninja to generate the final CSS files.
