[FEATURE REQUEST] More css-name to have more control over css customization

[Blist]

Is your feature request related to a problem? Please describe. Hello, I would like to have more control over css customization to be able to customization panel box left/middle/right and sway workspaces button container for exemple

Describe the solution you'd like All gtx box created should have a property name to able to be access by css selector and to be edited in style.css

Additional context Maybe I have missing some things about how Gtk works and something like that is already done by Gtk

Exemaple of level of customization i would like: https://i.redd.it/6cni5jbtlyw91.jpg https://i.redd.it/207tgukid1t91.png https://i.redd.it/ux7tmqcx2ix91.png https://i.redd.it/fuujqm9q7ox91.png https://i.redd.it/uh5cz1h7wsu91.png