brokaddr - 1:30 am on Apr 10, 2013 (gmt 0)
rainborick - Thanks for the explanation. Looks as though I misunderstood the property, which explains why I couldn't figure this out. :)
I got it to work by setting the width: in CSS as suggested.
lucy24 - I've been converting my site to responsive. The @media adjustments are one of the coolest things I've encountered since first learning html in the late 90s!