WTF, where is the css?
Google Chrome Developer Tools provides many, many functions.
One of the best features is the ability to find the location of the styling component in your style sheet.
This video tutorial will show how you can locate the CSS that pertains to the particular area of the HTML that you want to edit.
How to find location of CSS in your style sheet
This tutorial pertains to static websites.
But you may also use it for a CMS, although a much simpler
method is to use the Gutenburg Editor or the Page Builder
Editor (Beaver, Elementor, Divi, Brizy) in WordPress.