the database content should be displayed using a div with a class, for example:
<div class="myClass">
<database content here>
</div>
then create css to reset all of the tags using the class as the parent selector:
<style type="text/css">
.myClass h1,.myClass h2,.myClass h3,.myClass strong {
font-size:12px;
}
</style>
this CSS will set the font size to 12 for any h1, h2, h3, or strong tag that is a child of the div with class set to MyClass