Simple Catch – removing specific image border

Hi there, I've read several posts on how to remove the default image border in Simple Catch. The thing is, I just want to remove the border from a single image that I'm using as a "shadow" beneath thumbnails. I managed to do it by editing my style CSS using advice from another post, but it removed borders from all images on the site. So, any ideas on how I can remove the borders from only one image? Here's the link: http://www.designdevelopinspire.ca/cottage-deck-reno/ Thanks, Ian