It takes over 10 seconds to turn off fully. I had to go back and try it after your comment, because I thought that button just turned the page yellow, which was worse than the blue.

I ended up using reader mode to read the page. The whole site design undermined the point being made. One of the first things mentioned is not to be distracting. Yet they went out of their way to make their own site distracting. "Do as I say, not as I do."