Reduce space between logo and main menu

I would like to bring the left hand margin of the main menu closer to the logo. I know it can be done – my other site (https://control-line.bmfa.uk) has a similar layout – but with the gap between logo and Menu as I want it. Frustratingly, I cannot remember how I did it, so I would appreciate help.

• This topic was modified 4 years, 2 months ago by kiwibrit.

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