Inspiration from: https://slack.com/customer-stories/autodesk
Need to know what code to paste in – my coding knowledge is <basic b/c I know this is such a basic ask.
Any help would be appreciated <3.
Easiest option for you would be to use a clear container or box that is set up on top of everything else which is full page and covers the whole page which is setup to be shown until the required button is clicked on.
This button could be placed in your header and be set to be shown on just that page with code in your site tab.
So once the button is clicked on, the clear container or box can then be set to collapse which will allow all the elements behind it to now become accessible to the user.
https://www.wix.com/corvid/reference/$w.ViewportMixin.html
https://www.wix.com/corvid/reference/$w.HiddenMixin.html