When visitors click a button on my site, a window opens. In it, the scrollbar does not work, the only way to scroll down is with the scroll wheel of a mouse. The scrollbar does not disappear, but acts on the page that was left in the background, not in the window. Anyone know how to make a scroll bar appear in the window and act on it. If you need photos, ask for them, there is no problem. Thank you very much in advance!
Hey Felip 
I’m not sure I understand what’s wrong, please post screenshots of the issue you’re referring to.
Hi Ahmad! Does this help? The scroll bar moves the page that was left in the background, not the window. If someone enters without a mouse to this window, they can’t scroll down or up.
I have the same question, still no answer. Many thanks !