<style type="text/css">
.first  {color: red}
h1.first {font-size: 13pt}
p.para  {font-size: 12pt}
.really {font-weight:bold;color:blue}
.big {font-size:18pt}
#uniq {font-size:22pt;color:green}
</style>
.....
<h1 class="first">Title</h1>
<h1>Another title</h1>
<p class="first para">Paragraph with 
   <em class="really big">emphasis</em> in it</p>
<p>Another paragraph</p>
<h1 class="first" id="uniq">Unique Title</h1>