Origin Theme – Modify ruled line under header title?

Are you using a child theme or a custom CSS plugin?

I have a child theme installed. I don’t have knowledge of a “custom CSS plugin”.

Do you know how to use CSS?

Do you know how to answer a question? I want to modify a simple ruled line, not go to CSS school.

You ought to compromise between learning how to do things yourself and paying someone to do it for you. See WPyogi’s advice in your other thread regarding using Firebug to learn to use CSS or consider hiring someone at https://jobs.wordpress.net .

Alternatively use a CSS forum for CSS support.

I know how to do some things myself thank you.

Then you should have no problem using a developer tool such as Firebug to locate the CSS you need.

It is really beyond the scope of these forums to deal with general CSS issues. Try a dedicated CSS resource such as https://www.css-discuss.org/ instead.