Custom CSS in article body

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CSS

I'm in the process of reorganizing my articles. Before I press the 'Publish' button, does anyone know if custom CSS is possible? In one article I want to highlight some in-paragraph text like the following:

<style type="text/css">
.VseCallout {
   text-transform:uppercase;
   font-weight:bold;
   font-size: 90%;
   }
</style>

In the submission wizard, placing that code at the top in HTML view has the desired effects in the non-HTML view, but a preview indicates the code has no effect, and shows up at the top of the article as plain text. Of course I can hard code each instance, but that is far from optimal.

Thanks,
David