Font Size in Threads

[Dimster]

I'm not sure why or how I did this but for some reason the size of the text that I'm typing right now, and all the text I now view in all the threads has shrunk very tiny. I have tried to find a settings within our forum which I can access to see how I can get this text back to a more normal size but so far I haven't found the magic setting. At the moment I am using the cltr +/- on my keyboard but that's not a permanent fix. Is there a way for me to enlarge the text size? 

Oh so here's an oddity, I just click on Preview Post and the text size of the preview seems larger????