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.

dimitris33

This plugin adds suport for the TwentyFifteen theme to the <a href="https://wordpress.org/extend/plugins/styles" rel="ugc">Styles plugin</a>.
About Styles TwentyFifteen
Using this plugin with the Styles plugin you can instantly change the style of the TwentyFifteen theme from the customizer.
Features of the plugin
<ul>
<li>Instant previews</li>
<li>Text size</li>
<li>Google Fonts</li>
<li>Text colors</li>
<li>Border colors</li>
<li>Background colors</li>
<li>Hundreds of options</li>
<li>Consistent interface and names in every theme</li>
<li>Built on WordPress customizer, so Styles grows as WordPress grows</li>
</ul>
Styles and options for all built-in WordPress themes are free. More themes are available at <a href="http://stylesplugin.com" rel="nofollow ugc">StylesPlugin.com</a>.
Free Themes
<ul>
<li>TwentyTen: <a href="http://demo.stylesplugin.com/twentyten" rel="nofollow ugc">Demo</a></li>
<li>TwentyEleven: <a href="http://demo.stylesplugin.com/twentyeleven" rel="nofollow ugc">Demo</a></li>
<li>TwentyTwelve: <a href="http://demo.stylesplugin.com/twentytwelve" rel="nofollow ugc">Demo</a></li>
<li>TwentyThirteen: <a href="http://demo.stylesplugin.com/twentythirteen" rel="nofollow ugc">Demo</a></li>
</ul>
Developer Resources
<ul>
<li><a href="https://github.com/stylesplugin" rel="nofollow ugc">Styles on Github</a></li>
<li><a href="https://github.com/brainstormmedia" rel="nofollow ugc">Brainstorm Media on Github</a></li>
<li>Code Walkthrough: <a href="http://www.youtube.com/playlist?list=PLxj61Fojm1RGevBh10U2qCqjwoH4Awo-P" rel="nofollow ugc">How to add support for your own themes</a></li>
</ul>

Styles: TwentyFifteen

This plugin adds suport for the TwentyFifteen1 theme to the Styles plugin.

WP Add Custom CSS vs Styles: TwentyFifteen