Work better than expected! WP Version 6.3.1

After installation, navigate to SETTINGS in the left-hand side menu, where you will find this plugin. Assign it a name, for instance, .head (with a dot), and save it. Next, go to your header or menu, edit it, and in the right-hand menu under the ‘block’ tab, look for CSS. After the existing name (if there is one), add a space and type ‘head’ (but this time without the dot). Naturally, you can use any name you prefer instead of ‘head’. It works wonderfully. Thank you, Arjun!