This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

Add Admin CSS


Ever want to tweak the appearance of the WordPress admin pages by hiding stuff, moving stuff around, changing fonts, colors, sizes, etc? Any modification you may want to do with CSS can easily be done via this plugin.

Using this plugin you’ll easily be able to define additional CSS (inline and/or files by URL) to be added to all administration pages. You can define CSS to appear inline in the admin head (within style tags), or reference CSS files to be linked (via “link rel=’stylesheet’” tags). The referenced CSS files will appear in the admin head first, listed in the order defined in the plugin’s settings. Then any inline CSS are added to the admin head. Both values can be filtered for advanced customization (see Advanced section).

Links: Plugin Homepage | Plugin Directory Page | GitHub | Author Homepage


The plugin exposes two filters for hooking. Typically, code making use of filters should ideally be put into a mu-plugin or site-specific plugin (which is beyond the scope of this readme to explain). Bear in mind that the features controlled by these filters are also configurable via the plugin’s settings page. These filters are likely only of interest to advanced users able to code.

c2c_add_admin_css (filter)

The ‘c2c_add_admin_css’ filter allows customization of CSS that should be added directly to the admin page head.


  • $css (string): CSS styles.


 * Add CSS to admin pages.
 * @param string $css String to be added to admin pages.
 * @return string
function my_admin_css( $css ) {
    $css .= "
        #site-heading a span { color:blue !important; }
        #favorite-actions { display:none; }
    return $css;
add_filter( 'c2c_add_admin_css', 'my_admin_css' );

c2c_add_admin_css_files (filter)

The ‘c2c_add_admin_css_files’ filter allows programmatic modification of the list of CSS files to enqueue in the admin.


  • $files (array): Array of CSS files.


 * Add CSS file(s) to admin pages.
 * @param array $files CSS files to be added to admin pages.
 * @return array
function my_admin_css_files( $files ) {
    $files[] = '';
    return $files;
add_filter( 'c2c_add_admin_css_files', 'my_admin_css_files' );


  • A screenshot of the plugin’s admin settings page.


  1. Install via the built-in WordPress plugin installer. Or download and unzip inside the plugins directory for your site (typically wp-content/plugins/)
  2. Activate the plugin through the ‘Plugins’ admin menu in WordPress
  3. Go to “Appearance” -> “Admin CSS” and specify some CSS to be added into all admin pages. (You can also use the “Settings” link in the plugin’s entry on the admin “Plugins” page).


Can I add CSS I defined via a file, or one that is hosted elsewhere?

Yes, via the “Admin CSS Files” input field on the plugin’s settings page.

Can I limit what admin pages the CSS gets output on?

No, not presently. At least not directly. By default, the CSS is added for every admin page on the site.

However, you can preface your selectors with admin page specific class(es) on the ‘body’ tag to ensure CSS only applies on certain admin pages. (e.g. body.index-php h2, #icon-index { display: none; }).

Or, you can hook the ‘c2c_add_admin_css’ and ‘c2c_add_admin_css_files’ filters and determine the current admin page context to decide whether the respective hook argument should be returned (and thus output) or not.

Can I limit what users the CSS applies to?

No, not presently. At least not directly. By default, the CSS is added for any user that can enter the admin section of the site.

You can hook the ‘c2c_add_admin_css’ and ‘c2c_add_admin_css_files’ filters and determine the current user to decide whether the respective hook argument should be returned (and thus output) for the user or not.

How can I edit the plugin’s settings in the event I supplied CSS that prevents the admin pages from properly functioning or being seen?

It is certainly possible that you can put yourself in an unfortunate position by supplying CSS that could hide critical parts of admin pages, making it seeminly impossible to fix or revert your changes. Fortunately, there are a number of approaches you can take to correct the problem.

The recommended approach is to visit the URL for the plugin’s settings page, but appended with a special query parameter to disable the output of its CSS. The plugin’s settings page would typically be at a URL like Append &c2c-no-css=1 to that, so that the URL is (obviously change with the domain name for your site).

There are other approaches you can use, though they require direct database or server filesystem access:

  • Some browsers (such as Firefox, via View -> Page Style -> No Style) allow you to disable styles for sites loaded in that tab. Other browsers may also support such functionality natively or through an extension. Chrome has an extension called Web Developer that adds the functionality.
  • If you’re familiar with doing so and have an idea of what CSS style you added that is causing problems, you can use your browser’s developer tools to inspect the page, find the element in question, and disable the offending style.
  • In the site’s wp-config.php file, define a constant to disable output of the plugin-defined CSS: define( 'C2C_ADD_ADMIN_CSS_DISABLED', true );. You can then visit the site’s admin. Just remember to remove that line after you’ve fixed the CSS (or at least change “true” to “false”). This is an alternative to the query parameter approach described above, though it persists while the constant remains defined. There will be an admin notice on the plugin’s setting page to alert you to the fact that the constant is defined and effectively disabling the plugin from adding any CSS.
  • Presuming you know how to directly access the database: within the site’s database, find the row with the option_name field value of c2c_add_admin_css and delete that row. The settings you saved for the plugin will be deleted and it will be like you’ve installed the plugin for the first time.
  • If your server has WP-CLI installed, you can delete the plugin’s setting from the commandline: wp option delete c2c_add_admin_css

The initial reaction by some might be to remove the plugin from the server’s filesystem. This will certainly disable the plugin and prevent the CSS you configured through it from taking effect, restoring the access and functionality to the backend. However, reinstalling the plugin will put you back into the original predicament because the plugin will use the previously-configured settings, which wouldn’t have changed.

How do I disable syntax highlighting?

The plugin’s syntax highlighting of CSS (available as of WP 4.9) honors the built-in setting for whether syntax highlighting should be enabled or not.

To disable syntax highlighting, go to your profile page. Next to “Syntax Highlighting”, click the checkbox labeled “Disable syntax highlighting when editing code”. Note that this checkbox disables syntax highlighting throughout the admin interface and not just specifically for the plugin’s settings page.

Does this plugin include unit tests?



April 9, 2022
Awesome plugin, works fantastic Well done!
November 7, 2021
Hi, I am a beginner and have no idea about CSS coding and wondered if someone can help with providing the CSS code to replace the footer color of the website with an image, thanks.
June 12, 2021
This plugin did *exactly* what I wanted. A plugin had dropped some ad stuff into the Publish box, but it had a good CSS class, so I just hid it. I really like that the text field for holding the CSS is intelligent and does things like auto include closing brackets, code coloring, etc.
April 29, 2021
If you get fed up of all the nag screens from themes and plugins nagging you to “Go Pro” etc, then this is a great plugin for adding css to hide them all. Really easy to use.
Read all 35 reviews

Contributors & Developers

“Add Admin CSS” is open source software. The following people have contributed to this plugin.


“Add Admin CSS” has been translated into 3 locales. Thank you to the translators for their contributions.

Translate “Add Admin CSS” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.


2.0.1 (2021-05-30)


This recommended bugfix release addresses a potential conflict with other plugins that prevented the plugin settings page main content from being displayed.


  • Change: Update plugin framework to 063
    • Fix: Simplify settings initialization to prevent conflicts with other plugins
    • Change: Remove ability to detect plugin settings page before current screen is set, as it is no longer needed
    • Change: Enqueue thickbox during 'admin_enqueue_scripts' action instead of during 'init'
    • Change: Use is_plugin_admin_page() in help_tabs() instead of reproducing its functionality
    • Change: Trigger a debugging warning if is_plugin_admin_page() is used before 'admin_init' action is fired
  • New: Add new string (from plugin framework) for translation

2.0 (2021-05-12)


This recommended minor release updates the plugin framework, restructures unit test files, notes compatibility through 5.7+, and incorporates numerous minor behind-the-scenes tweaks.


  • Change: Outright support HTML5 rather than check for theme support of HTML5, since that isn’t relevant to admin
  • Change: Update plugin framework to 062
    • 062:
    • Change: Update is_plugin_admin_page() to use get_current_screen() when available
    • Change: Actually prevent object cloning and unserialization by throwing an error
    • Change: Check that there is a current screen before attempting to access its property
    • Change: Remove ‘type’ attribute from style tag
    • Change: Incorporate commonly defined styling for inline_textarea
    • 061:
    • Fix bug preventing settings from getting saved
    • 060:
    • Rename class from c2c_{PluginName}_Plugin_051 to c2c_Plugin_060
    • Move string translation handling into inheriting class making the plugin framework code plugin-agnostic
      • Add abstract function get_c2c_string() as a getter for translated strings
      • Replace all existing string usage with calls to get_c2c_string()
    • Handle WordPress’s deprecation of the use of the term “whitelist”
      • Change: Rename whitelist_options() to allowed_options()
      • Change: Use add_allowed_options() instead of deprecated add_option_whitelist() for WP 5.5+
      • Change: Hook allowed_options filter instead of deprecated whitelist_options for WP 5.5+
    • New: Add initial unit tests (currently just covering is_wp_version_cmp() and get_c2c_string())
    • Add is_wp_version_cmp() as a utility to compare current WP version against a given WP version
    • Refactor contextual_help() to be easier to read, and correct function docblocks
    • Don’t translate urlencoded donation email body text
    • Add inline comments for translators to clarify purpose of placeholders
    • Change PHP package name (make it singular)
    • Tweak inline function description
    • Note compatibility through WP 5.7+
    • Update copyright date (2021)
    • 051:
    • Allow setting integer input value to include commas
    • Use number_format_i18n() to format integer value within input field
    • Update link to to be HTTPS
    • Update readme_url() to refer to plugin’s readme.txt on
    • Remove defunct line of code
  • Change: Use plugin framework’s is_plugin_admin_page() instead of reinventing it
  • New: Add a recommendation for Add Admin JavaScript plugin to settings page
  • Change: Output the multiple tips on the settings page as a list instead of multiple paragraphs
  • Change: Prevent appending newline to value of setting passed to filter unless an actual value was configured
  • Change: Move translation of all parent class strings into main plugin file
  • Change: Tweak conditional checks to be more succinct
  • Change: Ensure there’s a current screen before attempting to get one of its properties
  • Change: Omit inline styles for settings now that plugin framework defines them
  • Change: Output newlines after paragraph tags in settings page
  • Change: Note compatibility through WP 5.7+
  • Change: Update copyright date (2021)
  • Change: Change plugin’s short description
  • Change: Tweak some readme.txt documentation
  • Change: Tweak some inline function and parameter documentation
  • Unit tests:
    • New: Add tests for JS files getting registered and enqueued
    • New: Add tests for add_codemirror()
    • New: Add help function get_css_files()
    • Change: Restructure unit test directories and files into tests/ top-level directory
    • Change: Remove ‘test-‘ prefix from unit test files
    • Change: In bootstrap, store path to plugin file constant so its value can be used within that file and in test file

1.9.1 (2020-09-25)

  • Change: Update plugin framework to 051
    • Allow setting integer input value to include commas
    • Use number_format_i18n() to format integer value within input field
    • Update link to to be HTTPS
    • Update readme_url() to refer to plugin’s readme.txt on
    • Remove defunct line of code
  • Change: Note compatibility through WP 5.5+
  • Change: Restructure unit test file structure
    • New: Create new subdirectory phpunit/ to house all files related to unit testing
    • Change: Move bin/ to phpunit/bin/
    • Change: Move tests/bootstrap.php to phpunit/
    • Change: Move tests/ to phpunit/tests/
    • Change: Rename phpunit.xml to phpunit.xml.dist per best practices

Full changelog is available in