@betro-hakala I don't even know what you want to be transparent. Also, if you are using Vanilla theme (not Persona) then the theme's options won't be in NodeBB Category options, those are completely different.
Could you send a screenshot of what you want transparent? That would help us help you.
Text color
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Markdown
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If your question is related to changes you want to make on your instance, you can try the Redactor Composer Plugin, it works with bbcode if i'm not wrong, that is it would support what you're looking for: https://community.nodebb.org/topic/6093/official-redactor-composer-now-available-in-0-7-1?_=1469356029163&page=1
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There are several plugins that add color, such as
mega-colors, as well as one of my ownrainbowsBoth add a button with a colorpicker, so you don't need to know the color syntax.
