One of my favorite things to do when stumbling upon a web page that uses an accessibility overlay is to use the overlay to increase the font size. I'm giving a 99.9% guarantee that this will cause the formatting on the page to break at some point. Couple that with increasing the line height and the letter spacing and you get a 100% return on your investment. Probably need to install a second overlay to fix this problem.

What happens on web pages when these three values are changed?