Making Button and search fields in-line

Hi, first of all, your product is amazing. I’m almost done developing my new website but I’m hung up one tiny but important area:

I’m only using one of the search fields (instead of 3) on the home page and I want the button to be next to the field rather than below it because it looks odd with them stacked so far apart. Is there additional CSS I can add easily to make it look correct?

Thanks in advance!