How do i fix my Facebook problem?

[Shorty]

i did the ctrl + V on a picture thinking that would paste and instead it made everything on my facebook small. my profile page, my news feed, pictures. i dont know how to reverse it. please some one help me! other websites are still normal. its just facebook that looks this way now.
omkg thank you soooooooo much!!!! it worked...i wish i could pick more than one best answer. it wont let me choose right now but thank you!!!

[Tyrell]

Idk try asking google

[deathwolf]

click into your facebook page and try pressing control and 0

[Adam]

Click somewhere on the web page and then press Control + 0, that should reset the size.