页脚出现时重新定位滚动到顶部按钮

There has to be a way to get my scroll to top button to treat the top of the #footer container as soon as a site user has scrolled down far enough so that the footer appears on screen, right? Right now it wants to just stay fixed in the lower left corner of the screen - which makes sense but there has to be a way to do what I'd like and as a novice I just can't seem to figure it out! Any help would be much appreciated. Thanks!There has to be a way to get my scroll to top b