I'm trying to find a way to create a custom HTML/CSS note so that I can put in my posts instead of having to install plugins every time. Something like below;

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Source: MDN Web Docs

  • Can you add more information? You can assign class names to blocks in standard block editor and then write custom CSS for how to display them. But that would depend on whether you're able to add CSS to your theme/child theme or customizer. – Tony Djukic Jul 27 at 17:09

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