Milan Dinić

This plugin automatically disables frontend database query for Custom CSS and Customizer section for setting Custom CSS, without need to manually choose any setting or option.
It is a very lightweight, it has no settings, just activate it and it works immediately.
And it’s on <a href="https://github.com/dimadin/disable-custom-css" rel="nofollow ugc">GitHub</a>.

Disable Custom CSS

Disable frontend database query and Customizer section for Custom CSS.

Łukasz Nowicki

Post/Page/Product-specific custom code allows you to add custom CSS styles to individual posts, pages, or WooCommerce products. It provides a dedicated area in the editor screen where you can write your CSS code. You can also choose whether the CSS should apply only to the single view or also to archive-type views.
A new meta box will appear below the content editor on the edit screen for posts, pages, and products. You can enter any custom CSS there and decide whether it loads only on the single view or also on archive pages like category listings or product grids.
<h3>Requirements</h3>
This plugin requires at least WordPress 5.0 (remember always to keep your WordPress installation up to date!) and PHP 7.4 on your server.

Post/Page Specific Custom Code

Great plugin!

A very useful plugin

Add custom CSS to posts, pages, or WooCommerce products, with optional archive support. Includes a dedicated editor box.

Disable Custom CSS vs Post/Page Specific Custom Code