A badget that is of the same dimensions as shields.io

If you look at https://github.com/srid/rib#readme - you will notice that the BuiltwithNix badget is oddly out of place, as it is _larger_ in size than the three other badges (which use shields.io). As long as it doesn't violate any of their terms, might be a good idea to make the badge look like theirs so it integrates well with the rest?