Julia template - navigation menu wraps/drops down awkwardly in portrait mode

I'm using Julia template for a wedding website. I've only got three items in the top navigation bar but when these are viewed on a tablet in portrait mode, the last items drops down/wraps really awkwardly. i think it's because the thin lines at each side of the Nav bar are too wide but I can't find a way to shorten them and edit them to stop this happening.

Any ideas?

Attached are pics of both landscape and portrait mode.

@paperwallah You can use Custom code to handle. Need site url to check code.