All boxes and locations are using pixel addressing. When you increase the text-size the text will not fit as the box will not grow.
Use the Chrome built in resize where you can enlarge the whole window, not only the text.
I have no English Chrome available now, it is in my dutch version the fourth menu entry where you can enlarge the total window, not only the text-size.
Attached image, left chrome in large size, right FF in normal size.
With both sizes the text fits.
Wim
