For the stream status snippets (including the now-playing code) we don't apply any styling so it'll inherit the CSS from your page.
If you want to apply custom CSS, just use the ID of the or generated by Centova Cast as your CSS selector. e.g., for:
Loading...
your CSS selector would be:
#cc_stream_info_summary
so your CSS stanza might look like:
#cc_stream_info_summary {
font-size: 10px;
color: red;
}