Mobile menu items different to desktop

[HannahFincham]

Hi!
Is there a way to remove a menu item from my phone menu but not from the desktop? As it's a link to a web page that doesn't work on mobile devices.
This is the website in question:
http://bridgingages.co.uk/
Thanks!

[mariusjopen]

Dear @HannahFincham

.mobile-nav #menu-item-75 {
    display: none;
}

Library is gone on mobile now.

Best!

Marius