removing line under menu Crawford theme

Hi – i have looked for an answer to this on the forum and attempted to amend the code from the instructions i’ve found without success.

I am wanting to remove the grey line under the menu

and also to set the page width so the site doesn’t move around on the page – from left to right.

I am amending the original style sheet as i’m not sure how to do otherwise.

Many thanks, Nikki

The page I need help with: [log in to see the link]