Make CSS work when using Markdown

I know I've just suggested but this isn't spam suggestion. Anyways,

I'd like to style my posts with CSS, but have realised that this is impossible, because it is not supported.

I was going to make the text wide to try and take the mickey out of Roblox Physics, the green bit is because I thought I might have done it wrong so I asked chatgpt for a simple inline css thing and yeah hehe.

Discourse-powered forums use bbcode and changing it to css is very unlikely (at least I think so because I don’t have much experience in this)

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HTML and CSS are practically lifelong friends