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I actually did not know you could do it the way Christopher posted. Good to know. Another way is to go to the menu tab that is the three horizontal lines on the right side of the browser. Once you click the menu tab, the sixth option down (at least on my version of Chrome) is the zoom setting. Just click the little minus tab, and bring it back down to 100%. I've had this happen to me before too, and I couldn't figure out how to fix it other than that, which I don't understand since I resized the screen without going to the menu. Really, this is an example of a poor UI, and I'm surprised Google didn't do a better job on it. The solution isn't obvious, but it should be.