Please fix the font problem! I’ll have to go to another email, there’s no way anyone can read their mail!

The font changed to a smaller size when Hotmail changed the "look" of the entire site. But the biggest problem happened today when in the middle of an email I was composing, the font suddenly became microscopic & I can't find a way to read anything or change it.
What is going on? Things were fine before somebody " improved" the site. Hopefully it will be fixed by the time I'm notified that there's a response, otherwise I'll never be able to read that someone actually responded.