Soft Reject - need help with line lenght requirements

Hi there,
I’ve just another soft reject for my WP theme and as a rookie I don’t understand all improvements which they expect from me. This time the thing is about line lenght:
" Ideal line length is between 45 and 75 characters. However, I’d recommend that line length does not exceed 95 characters. Example(s): "

I realize that this is a standard line lenght to keep content readable but the screenshot does not shows me where precisely I should limit the number of character.

Please help me, maybe some of you had similar problem.