Actually here is the biggest problem of Wix is it’s not structured where I used a collapse to collapse some text over the site where when button clicks then text expand but I found the blank space from button to footer…
I think Wix have to work regarding this bug 
https://www.purityselect.com/cut-and-ripped-plus/ here is the website where I used to collapse and expand functions
Any solution maybe? I have the same problem.