Add colorful highlight boxes to Markdown content (Quark theme)

Grav Community,

I’d like to add some colorful highlight boxes around content. I like the colors used in the Markdown Notices, but those are only for a bit of text, not for blocks of Markdown content.

I noticed that Spectre.css has hero layout blocks, and I’ve tried using them by wrapping content in the div tags, but the colors are restricted, I’m not happy with their appearance, and I’m not sure they should be used in that way.

Does anyone have a suggestion for adding colorful highlight boxes?