How to find and import default css tags from php file

I have a report generation page, that is PHP based, but I can't use basic CSS classes in it for some reasons. For example, the i-column-header class doesn't do anything. I am Using PHPStorm and if I go into a CSS file, I see that it has the classes, and it says "from html". Screenshot I am not sure where the html is located, or how to reference it from my PHP file. I am ok with just having a CSS file with all of those default classes hanging around. Can anyone please tell me where to find the classes, or if there is a resource where they are located.

https://stackoverflow.com/questions/66575087/how-to-find-and-import-default-css-tags-from-php-file March 11, 2021 at 09:06AM