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Modular Custom CSS
WordPress core provides custom CSS functionality in the customizer that's specific to the current theme; you can switch themes freely with each t …
The facts
- Rating
- 5★ from 6
- Active installs
- 400+
- Price
- Free
- Last updated
- 19 Jul 2026
- Added
- Aug 2014
- Requires WP
- 4.9
- Tested up to
- WP 7.0.4
- Downloads
- 18,863
Our analysis
AI-assistedModular Custom CSS is a WordPress plugin that allows you to add global CSS that persists across theme changes. Unlike the built-in customizer, which stores CSS specific to each theme, this plugin provides a separate option for CSS that remains consistent regardless of the active theme.
The plugin features live-preview functionality, enabling you to see changes in real-time before publishing. It is suitable for users who want to maintain specific styling across various themes without losing their custom CSS.
Best for: This plugin is best for users who frequently switch themes but want to maintain consistent styling.
What it does well
- ✓Allows global CSS that persists across theme changes
- ✓Live preview of CSS changes in the Customizer
- ✓Free to use from the WordPress.org directory
- ✓Compatible with WordPress 7.0.4
Where it falls short
- •Limited information on additional features or support
Verdict
Modular Custom CSS offers a straightforward solution for managing global CSS across themes. It may be particularly useful for developers and site owners who require consistent styling without theme dependency.
From the developer
Nick Halsey's own description of Modular Custom CSS, lightly tidied.
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).
Tagged as
purpose
Code Snippets & Developer Tools
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