thirstperson

Thanks! I should have thought of that from using phpBB, but I didn’t!

Look at the line that starts:

.entry img{padding: 0px 5px 5px 5px;border: 1px solid #ddd;

See what happens if you remove the 1px solid #ddd bit

Just do a search (CTRL F) for .entry img on your layout.css file and you should find the bit you need to replace soon enough.