Why black lines on my orange sign up button?

Why are there vertical lines on the ends of the orange button to sign up for a listing? And how do I delete them? See attached image. My site is not live yet, so I can't post url.

 

If you are using the old version of theme then please update your theme.
After updation check whether this issue is resolved or not.

 

I am using Wordpress 3.5.1 with GeoCraft 1.7.1

Website is now live: www.rebuildnewjersey.com

The lines are still there on the button. Thanks.

 

We have checked your website and there is no lines on the button, You are checking your site at 110% screen resolution, Set it to standard (100%), This will solve your issue.

 

Cheers, that's the issue.

By the way, fantastic work on this theme. It's really impressive and exactly what I was looking for. So glad I found it.