Hi, I just started blogging and I have the twenty-eleven theme. Why, when I publish a post in "image" format, does a black border appear around my photos? The posts that I've published in "gallery" format have a light grey post, which I'm fine with. I don't really like the black border. When I'm drafting the post and even when I hit "preview post", the borders around my pics appear light grey, but when I hit publish and then visit the actual post, the black borders are there. Is this a feature that is unique to the IMAGE format? Is it because I've added text to the picture (so writing appears in the border)?
The blog I need help with is happyhooligans.wordpress.com.