Found it. I did not close a script tag.
You would just need to define the class in the stylesheet. You can insert something like:
.excerpt {
font family: Verdana, Arial, Helvetica, sans-serif;
color: #8B7F74;
font-size:12px;
}
Then when you use the <div class="excerpt"><?php the_excerpt(); ?></div> tag, whatever your excerpt is will have the formatting your specified in the CSS.
I usually put my CSS stuff under ‘navigation’ or with whatever section uses the .name { format.