How do I fix broken search widget in Scribe?

In certain browsers the search widget in the scribe theme is all crooked and showing the label “search for:”

I didn’t see it until a client complained about it. I hadn’t seen it when I checked in multiple browsers before, but I must have missed it– because when I looked at it just now in Firefox it was there.

Can I just get rid of it with CSS? I know it is a small fix but I am useless with code.