Modifying drop cap

This plugin offers the functionality I want, but the FAQ is inaccurate in terms of customizing the code. Lines 12, 13, 15, etc of styles.css have nothing to do with text color or size. It would be helpful to know where within the css file the short code resides for I certainly cannot find it.

I would appreciate a bit more info here.

thanks

https://wordpress.org/plugins/drop-cap-shortcode/