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WordPress core provides custom CSS functionality in the customizer that’s specific to the current theme; you can switch themes freely with each theme’s additional CSS remaining in place. Sometimes, you need some CSS to apply regardless of the current theme persistently. This plugin adds a plugin CSS option for CSS that’s global and persists across theme changes.

With the Customizer, your CSS is instantly live-previewed, offering the ability to see exactly how your site will look before you publish your changes. The plugin CSS option is stored as an option. Prior to WordPress 4.7 (which introduced additional CSS in core), theme-specific CSS was stored as a theme_mod, in 4.7 and newer this is migrated to the core CSS functionality (which is theme-specific).

Download

Latest version: Download Modular Custom CSS v2.1

Modular Custom CSS has been downloaded times through WordPress.org.

Installation

1. Take the easy route and install through the WordPress plugin installer, OR,
2. Download the .zip file and upload the unzipped folder to the /wp-content/plugins/ directory
3. Activate the plugin through the ‘Plugins’ menu in WordPress
4. Go to the Customizer (Appearance -> Customize) to add custom CSS to your site.

Screenshots

1. 

   Additional CSS Section in the Customizer in WordPress 4.9.

Changelog

2.1

• Leverage the Code Editing control in WordPress 4.9 to add syntax highlighting, hinting, and more.
• Add more-descriptive text to the core theme CSS control, to distinguish it from the plugin CSS control.
• Add plugin textdomain to facilitate translations.

2.0

• Migrates theme CSS to the core custom CSS functionality in WordPress 4.7.
• Adjusts the plugin CSS option to use the edit_css capability introduced in WordPress 4.7. As a result, multisite networks will need to provide this capability to site administrators for them to be able to access CSS now.

1.0

• First publicly available version of the plugin.
• Requires WordPress 4.0+.