ok, so I investigated my own advice and think I came up with a fix.
This is what I did to get rid of the line.
AdminCP>Styles & Templates>Style Manager>Main CSS>
Now scroll down to "First Alternating Color". You'll see something like this:
Code:
border-left: 1px solid #212121;
border-right: 1px solid #212121;
border-top: 5px solid #212121;
border-bottom: 5px solid #212121;
Change the 5's to 0's and save. I'm not sure if you have to do it in the "Second Alternating Color", but I did and it didn't seem to hurt.