How do I create a single.php file as the default template for single posts in the twentytwentythree theme?

The answer is, AFAIK, that you shouldn’t. It goes against how block themes work. Rather you should try to get your css to work with the block theme. What are the issues with getting your CSS to work with the new editor?

You can add it as style.css in your child theme, or you can add custom block styles with a simple plugin. The later is my prefered method as it works quite well with the block editor, and as a plugin it can be used even if I switch themes.

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