Title: custom css dont support CGI units. why?
Last modified: April 2, 2026

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# custom css dont support CGI units. why?

 *  Resolved [lukafuka](https://wordpress.org/support/users/lukafuka/)
 * (@lukafuka)
 * [2 weeks, 4 days ago](https://wordpress.org/support/topic/custom-css-dont-support-cgi-units-why/)
 * custom css dont support CGI units. it converts cgi unit to vw. why ???

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

 *  Plugin Support [rodicaelena](https://wordpress.org/support/users/rodicaelena/)
 * (@rodicaelena)
 * [2 weeks, 4 days ago](https://wordpress.org/support/topic/custom-css-dont-support-cgi-units-why/#post-18869723)
 * Hi,
 * Thank you for writing. Can you please share more specific details on the issue?
   I’m not aware what CGI units are.
 * Thank you!
 *  Thread Starter [lukafuka](https://wordpress.org/support/users/lukafuka/)
 * (@lukafuka)
 * [2 weeks, 3 days ago](https://wordpress.org/support/topic/custom-css-dont-support-cgi-units-why/#post-18870026)
 * i wrote this code as custom css for button block (using your block’s extension
   field for custom css):
   font-size: clamp(14px, 4cqi, 28px);but on front end I 
   have this css code:
 * font-size: clamp(14px, 4vw, 28px);
   it was automatically changed and I dont understand
   why.
 *  Plugin Contributor [Robert Soare](https://wordpress.org/support/users/soarerobertdaniel7/)
 * (@soarerobertdaniel7)
 * [1 week, 3 days ago](https://wordpress.org/support/topic/custom-css-dont-support-cgi-units-why/#post-18875954)
 * Hi,
 * In our isolated cases, the issue does not manifest; we suspected that our old
   CSS minifier might be the problem, but it does not modify new modern CSS code.
   Besides Otter, do you have any other plugins that may manipulate the CSS (like
   optimizers that rewrite the CSS to be compatible with older browsers)? Also, 
   can you share an example of how you used it (in case we might be an edge case
   that we are not aware of)?
 * Thank you!
    -  This reply was modified 1 week, 3 days ago by [Robert Soare](https://wordpress.org/support/users/soarerobertdaniel7/).

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

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 * 4 replies
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 * Last reply from: [Robert Soare](https://wordpress.org/support/users/soarerobertdaniel7/)
 * Last activity: [1 week, 3 days ago](https://wordpress.org/support/topic/custom-css-dont-support-cgi-units-why/#post-18875954)
 * Status: resolved