Hi @baxter89 – if you let me know your specific goal I’d be glad to share the best way to accomplish it.
To answer your question, the Additional CSS classes section is a way to target a specific block with custom CSS by giving it a class that can be styled with custom CSS. There’s an article over at WordPress.com which explains them pretty well:
https://wordpress.com/support/wordpress-editor/adding-additional-css-classes-to-blocks/
Once you’ve added your unique class to the block, you would then add corresponding custom CSS in the Customizer’s Additional CSS panel.
Block themes like Twenty Twenty-Three are designed to be edited through the Site Editor and block settings, and not through custom CSS. For this reason, the Customizer and its Additional CSS panel remains hidden by default in block themes. Nonetheless, you can still use it if you can’t accomplish what you’re trying to achieve through block settings, by appending /wp-admin/customize.php
after your URL.
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This reply was modified 1 year, 11 months ago by Kathryn Presner. Reason: fixed typo