Can't Scroll or difficult to scroll depending on the browser used

Can’t Scroll in latest Firefox browser with either up and down arrows on keyboard or with mouse cursor. Too difficult to scroll in latest Chrome browser, as up and down arrows on the keyboard don’t work, but can scroll up and down with mouse cursor, even though a vertical scroll bar doesn’t appear next to where I’m clicking. The most outer scroll bar to the very right side of the screen appears, but that one isn’t for the scrolling of the inner ChatGPT chat.