Greetings.

I do this kind of stuff occasionally, so I am of little use without a reference (which I do not have by now) however: say

<foo>this is your tag</foo>
[download]

then you can style it in a CSS2 stylesheet like this:

foo {
display:block;
color:red;
}
[download]

Which tells the formatter you have got a block level element, and to color it in red...

See for instance:
http://www.zvon.org/xxl/CSS2Tutorial/General/htmlIntro.html

Cheers,
alf
--
You can't have everything: where would you put it?