Title: unused CSS
Last modified: May 19, 2020

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# unused CSS

 *  Resolved [kirstenvanharten](https://wordpress.org/support/users/kirstenvanharten/)
 * (@kirstenvanharten)
 * [5 years, 12 months ago](https://wordpress.org/support/topic/unused-css-9/)
 * Hi
    My run test advises me to delete any unused CSS, but how do I know if the
   CSS isn’t been created or used by my theme?
 * I’ve only added a very small amount of custom CSS in my customizer and am only
   working with the neccesary plugings..
 * Thanks.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Funused-css-9%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Support [Imran – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support9/)
 * (@wpmudev-support9)
 * [5 years, 12 months ago](https://wordpress.org/support/topic/unused-css-9/#post-12861283)
 * Hello there [@kirstenvanharten](https://wordpress.org/support/users/kirstenvanharten/)
 * Removing unused CSS is not a simple process. An unused CSS selector in a stylesheet,
   needs to be identified before removing it. And you need to be extra careful because
   removing some CSS, that can seem to be unused, can break your site’s appearance.
 * Please see here some details information about how it’s done:
    [https://css-tricks.com/how-do-you-remove-unused-css-from-a-site/](https://css-tricks.com/how-do-you-remove-unused-css-from-a-site/)
   [https://www.keycdn.com/blog/remove-unused-css](https://www.keycdn.com/blog/remove-unused-css)
 * It is best to find someone that is very familiar with CSS on your site and knows
   how to do it, to make these changes for you.
 * Kind regards,
    Nastia
 *  Thread Starter [kirstenvanharten](https://wordpress.org/support/users/kirstenvanharten/)
 * (@kirstenvanharten)
 * [5 years, 12 months ago](https://wordpress.org/support/topic/unused-css-9/#post-12862843)
 * Thanks!
 *  Plugin Support [Laura – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support8/)
 * (@wpmudev-support8)
 * [5 years, 12 months ago](https://wordpress.org/support/topic/unused-css-9/#post-12874854)
 * Hi [@kirstenvanharten](https://wordpress.org/support/users/kirstenvanharten/)
 * I’m glad we could help!
 * I’ll mark this thread as resolved for now but if you come across any follow-up
   questions, please feel free to let us know at any time.
 * Best regards,
    Adam

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘unused CSS’ is closed to new replies.

 * ![](https://ps.w.org/hummingbird-performance/assets/icon-256x256.gif?rev=2633221)
 * [Hummingbird Performance - Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN](https://wordpress.org/plugins/hummingbird-performance/)
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 * 3 replies
 * 3 participants
 * Last reply from: [Laura – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support8/)
 * Last activity: [5 years, 12 months ago](https://wordpress.org/support/topic/unused-css-9/#post-12874854)
 * Status: resolved