Does anyone know how I could set my nav bar to fade in as you scroll like this: https://wixprothemes.wixsite.com/imaginetravel ? At the moment I have got it coming in but it is not smooth like the example.
See the Wix Support pages for the header.
https://support.wix.com/en/article/changing-the-header-scroll-settings
Otherwise, you can do similar with code.
https://www.wix.com/corvid/forum/corvid-tips-and-updates/fixed-frozen-header-example
https://www.wix.com/corvid/example/sticky-header