[Feat] Add class support

[mobsenpai]

Having class support would be very helpful as I am currently using span tag to achieve my waybar setup which is working great only thing missing is the ability to configure some paddings within the elements of those span tags.

It is a great bar, I just need to define specific padding in those elements. Specifically I would like to increase the height or top+bottom padding of the right side modules, [why?] because if I increase the height of my bar the height of the right padding modules remain the same i.e they don't keep in ratio with it. Here is how it will look after increasing height: As you can see the left modules are prefect but the right modules need some top+bottom padding which I can't provide rn. I would love to know if there is any other way of achieving it rn, which I don't believe there is, but, I request devs to look into this feature request.

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My bar

It's config config style.css