Center alignment line- color change when dead center


#1

When I’m aligning items on the page, is there a way to make it so the vertical alignment line changes color when I’m in the center of the page? I can never tell if I’m aligning something dead center in the page, so by the time I’m halfway down a layout I’ve already made items above it off-center, so I’m just creating a jenga tower of content. 

If anyone has any tips for me thanks in advance! I’m sure there’s a way to do it that I’m missing.