Shrunk font size, messed up formatting

I’m using the Warped theme by Kaushal Sheth. The font in the header was a little too big, so I dropped the size down. Unfortunately, that then messed up the formatting, so that I have random red lines and black boxes at the top. I’m having trouble tracking down which CSS element I need to shrink to get it to appear correctly: could someone give me a pointer? Thanks.

Blog: http://blog.donnael.com/