Admin theme plugin – CSS problem

You need to enqueue the stylesheet, and then hook it into the appropriate hook. See the “Enqueueing Admin CSS” section of my Settings API tutorial.

Note: you will want to use the admin_print_scripts hook, if you are modifying the CSS for the Admin UI as a whole. Be very judicious when hooking into admin output globally like this.

Hi Chip, and thanks for the reply.

I have changed my code to. php document -> https://pastebin.com/6sAFsLwP

But CSS is still not working. This is my first plugin and my php knowledge is very low. Can you please look at my code and tell me where I got the error.

Thanx