Markdown can be themed by specifying a theme attribute, e.g.;
<markdown theme="theme1">
...
</markdown>
When unspecified, this will default to a theme named default.
This attribute allows you to target CSS directly on the markdown.
The default theme includes some basic table styling and nothing more.
Custom Themes
When a markdown element is converted to markdown it is wrapped in a DIV with an attribute of theme=theme-name, according to your specified theme or default.