Me again.
If you look at
http://en.wikipedia.org/wiki/Template:In_creation you
will see that the template box has a light grey background. I've tried
copying a rather large section of MediaWiki:Common.css to my own wiki's
Common.css but I'm obviously not grabbing the right part. Can you advise
when section is the correct one to grab? It does not appear to be in the
group starting with
/* Article message box styles */
and ending much further below with
/* Allow for hiding text in compact form */
.compact-ambox .hide-when-compact {
display: none;
}