Custom plasmo css

Does plasmo have custom classes prebuilt in? Like plasmo-fixed or how does that work? Referrring to this (https://github.com/PlasmoHQ/examples/tree/main/with-tailwindcss)
GitHub
🔰 Example projects that demonstrate how to use the Plasmo Framework and integrate with popular tools - PlasmoHQ/examples
examples/with-tailwindcss at main · PlasmoHQ/examples
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