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You can create a . php file that will process the css, just at the beginning of it put the following header
header("Content-type: text/css; charset: UTF-8");
And on the pages you will use, do the following:
<link rel="stylesheet" href="arquivo_do_css.php">
The browser will interpret the file as a stylesheet, regardless of the extension, due to the header and link tag.
Celestino welcome. Guy avoid posting code image. Click ai on the edit link of your question is copy and paste the same code ok
– hugocsl