Simple Custom CSS


An easy-to-use WordPress Plugin to add custom CSS styles that override Plugin and Theme default styles. This plugin is designed to meet the needs of administrators who would like to add their own CSS to their WordPress website. Styles created with this plugin will render even if the theme is changed.

** New in Version 4.0.2 **
– Uses native WP CodeMirror on settings page (Does not load unnecessary scripts)
– Tested for WP version 5.1.1
– Tested for PHP version 7.2


  • Customizer Control
  • Mise en valeur utile de la syntaxe du code
  • Code linting (error checking)
  • Aucune configuration n’est nécessaire
  • Une interface simple basée sur l’UI de WordPress
  • Virtuellement aucun impacte sur les performances du site
  • Aucune requête complexe dans la base de données
  • Documentation détaillée
  • Allows Administrator access on WP Networks (Multisite)

Captures d’écran

  • The Simple Custom CSS Administration Screen

  • The Simple Custom CSS Customizer Section


Install Simple Custom CSS just as you would any other WP Plugin:

  1. Download Simple Custom CSS from

  2. Unzip the .zip file.

  3. Upload the Plugin folder (simple-custom-css/) to the wp-content/plugins folder.

  4. Go to Plugins Admin Panel and find the newly uploaded Plugin, « Simple Custom CSS » in the list.

  5. Click Activate Plugin to activate it.

  6. Begin using the plugin by going to Appearance > Custom CSS in the Admin Menu, or Appearance > Customize, then click on the « Simple Custom CSS » section.

Plus d’aide pour installer les extensions


Will this Plugin work on my website?

Sorry, this plugin is available for use only on self-hosted ( websites.

My Custom CSS isn’t showing up

There are several reasons this could be happening:

  • Your CSS is targeting the wrong selector.

  • Your CSS selectors aren’t specific enough.

Par exemple, vous pourriez avoir :

a {
    color: #f00;

When you need:

\#content a {
    color: #f00;

The specificity you need depends upon the CSS rules you are attempting to override.

  • Votre CSS n’est pas valide.

Veuillez vérifier votre CSS en utilisant le service de validation de CSS du W3C.


21 juin 2019
Warning to any one using this plugin: This plugin has been around for years at yet still loads CSS in the most inefficient way, serving the CSS using a dynamic non-cacheable request on every page. This will not only affect the first page visited but will delay the render of every subsequent page visited. My advice would be to remove this plugin and use the default WordPress CSS editor, under the appearance > customize tab. There's simply no reason to use this plugin.
28 mai 2019
Simple, lightweight and perfect. It's the first plugin I add to all my sites. Has a decent sized viewer, unlike the css option in customizer that comes with some themes. Zero problems with this plugin.
2 mai 2019
Clean and simple as a Custom CSS plugin is supposed to be. Tired of all the silly un-needed bells and whistles getting added to CSS plugins. If you could move it out of the Appearance sub nav group and into its own link in the dashboard nav so I can go right to it while editing, I'll change this to 5 stars in a heartbeat!
7 mars 2019
The add-on works immediately after installation. That's what I expected
17 décembre 2018
Very good plugin! Thanks!
Lire les 146 avis

Contributeurs & développeurs

« Simple Custom CSS » est un logiciel libre. Les personnes suivantes ont contribué à cette extension.


“Simple Custom CSS” a été traduit dans 22 locales. Remerciez l’équipe de traduction pour ses contributions.

Traduisez « Simple Custom CSS » dans votre langue.

Le développement vous intéresse ?

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  • Use WP’s CodeMirror on settings page
  • Tested for compatibility with WP version 5.1.1
  • Tested for compatibility with PHP version 7.2


  • Fixed bug with broken editor styles on older versions of WP.


  • New Customizer Control (still compatible with older WP versions)
  • Added colors and linting to the Settings Page
  • Updated hooks to replace hyphens with underscores
  • Tested for WPCS compliance
  • Tested for compatibility with WP version 4.9.4


  • Added support for https://
  • Added base support for Danish language. Thanks @ThomasDK81!
  • Tested for compatibility with WP version 4.4.1


  • Tested for compatibility with WP 4.1
  • Improved architecture to reduce the number of queries (Thanks, @dvankooten!)


  • Tested for compatibility with WP 3.9.1
  • Sidebar « Update CSS » button added


  • Added Sytnax Highlighter
  • Removed Need for « Allow Quotation Marks » checkbox
  • Removed plugin attribution text
  • Allow Administrator access on multisite
  • Minor styling changes. Thanks @kucrut!


  • Fixed issue with WP installs in subdirectories. Thanks @lopo!
  • Tested for compatibility with WP 3.8.1


  • Added option to allow Double Quotes in CSS
  • Tested for compatibility with WP 3.8


  • Tested for compatibility with WP 3.7.1
  • Code update to conform fully with WP coding standards


  • Donner aux Admins (pas seulement aux Super Admins) l’accès à l’extension
  • Correcting Credit error
  • Minor Bugfixes


  • Allowing the « > » direct child selector.


  • Removed unneeded hidden input
  • Added Action Hooks
  • Added cleanup on deletion
  • Added author attribution option
  • Added a more elegant method for adding CSS to the page:

Instead of using print_scripts() to insert the CSS directly into the HEAD, CSS styles are generated within simple-custom-css.php, then added via wp_enqueue_scripts, so now it will appear in the HEAD as:

    <link rel="stylesheet" href="" />

…even though no css file is actually generated. Please see the comments within the Plugin file for more detailed information.


  • Initial Release