Hi Craig,
Thanks! That did the trick.
My version is below. I changed the colors to match TextMate's and I had to change "meta_diff_header" to "meta_diff_range."
.markup_deleted_diff{ background:#f54; color:white; display:block; }
.markup_inserted_diff{ background:#7f8; display:block; }
.meta_diff_range{ background:#47d; color:#fff; display:block; }
Thanks again!
Arturo