Google Crome has englarged one page? How do I make it normal sized?

I accidently enlarged Facebook on Google Crome the other day and I don't know how to make it normal sized again. If I go on any other page on the browser it's fine apart from Facebook. Please help!?|||Use the keys CTRL and the - (minus) sign - the key next to the += sign. If that doesn't work, go to the toolbar across the top, to View and zoom out|||Hold down ctrl and use your middle scroll button on your mouse.