hiphopredux on "Post images contain borders - don't want"

Hey I'm having some issues with my posts in which a small grey border is being added to every image without me wanting to. I'm guessing its a problem with the style.css but I'm very green when it comes to website coding so I don't really know where to start. Here's an example post on my website in which this is a major problem: 50 saddest Hip Hop Tracks

Thanks for reading and helping!

bump, this is still affecting me and it seems to be a specific problem for me as all other topics on the same issue have produced no results when I try the same methods as other suggestions. It's likely a specific bit of code on my wordpress site.