Custom jQuery

Hi, thanks for your theme, it’s working well for my purposes.
I use a theme based on yours, I changed a slider to a fixed image, but a menu looks quite weird, so I decide to make it appear on scroll. I gave nav-menu classes visible-xs and hidden-header and used this code in custom.js of hotel-galaxy theme:
jQuery(window).scroll(function () {
jQuery(‘hidden-header’).removeClass(‘visible-xs’);
});
It’s not working, I don’t know why.
Thanks in advance for any help!

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