Daniele De Santis

WP Add Custom CSS allows you to add custom CSS to the whole website and to individual posts, pages and custom post types (such as Woocommerce products). 
The CSS rules applied to the whole website will override the default stylesheets of your theme and plugins, while the CSS rules applied to specific pages, posts or custom post types will override the main stylesheet too.
The plugin works with the most popular builders, such as Elementor, Gutenberg and the Classic Editor.
You can edit the main stylesheet from the the “Add custom CSS” settings page. 
The plugin also creates a new “Custom CSS” box in the editing area to add custom CSS to specific posts, pages and custom post types.
Select the preferred CSS output method from the plugin’s settings page to ensure seamless integration with caching and minification plugins or to improve above-the-fold rendering performance.

WP Add Custom CSS


Says it has not been tested against recent versions, but it works great still. Simple and elegant solution. Sep 13 2024


Still works great

Add custom css to the whole website and to specific posts and pages.

philipwalton

davidosomething

Properly and safely add specific Javascript and CSS stylesheets to single posts, pages, and custom post types.
Features:
<ul>
<li>Dynamic URLs with <code>%HOME_URL%</code>, <code>%SITE_URL%</code>, and <code>%THEME_URL%</code> variables</li>
<li>Script dependency support as well as script duplication checking</li>
<li>The option to load scripts in either the header and footer</li>
<li>Attach scripts to posts, pages, and custom post types</li>
<li>Load attached scripts and styles not just on that post’s page, but on the home page or any other page where that post is displayed.</li>
</ul>
For complete documentation, visit <a href="http://philipwalton.com/2011/09/25/per-post-scripts-and-styles/" rel="nofollow ugc">philipwalton.com</a>

Per Post Scripts & Styles

Properly and safely add specific Javascript and CSS stylesheets to single posts, pages, and custom post types.

WP Add Custom CSS vs Per Post Scripts & Styles