How to make navigation on Twenty Twenty-Three sticky?

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I am creating a child theme from Twenty Twenty-Three. I tried adding custom CSS classes but couldn’t find the customize under appearance. Tried to create my own stylesheet, but couldn’t find functions.php. Can anyone help?

Yes, absolutely! First, you will need to make sure that your child theme is working correctly. To do this, you will need to access the WordPress Admin Dashboard and open the Themes page (Appearance > Themes). From here, you will need to make sure that your child theme is activated and visible. Once you’ve done this, you can create a custom CSS class by adding a stylesheet to the child theme’s directory. This stylesheet should be named ‘style.css’, and you can add some custom CSS to it in order to define your custom classes. You can also add some custom functions to your child theme by creating a file named ‘functions.php’ in the same directory. This is where you can define custom functions for use in your theme. Finally, you can add the Customize button to the Appearance menu by going to the WordPress Admin Dashboard and editing the menu under Appearance > Menus (#menu-appearance). Here you can add the Customize link, which will open up the customizer settings. I hope this helps!