Remove unused CSS

Hello,

I am having this issue with Google page insights about “Removing unused CSS”

“Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity.”

http://www.mywebsite//min/7fd45.css

I did a search on this forum and I tried the solutions suggested here:
https://blog.litespeedtech.com/2018/06/20/critical-css-and-litespeed-cache/

I have done that but I am still getting the same problem with Google page insights.

LiteSpeed Report number: QYNOWOUI