[Plugin: Countdown Timer] CSS instructions

Hi, I am loving the plugin but there are no CSS files I can edit to change the font/size of the output.

Do I need to do it by adding css to style.css? Can you quickly show an example of how this is done (using the fergcorp_countdownTimer_event_time class)?

I tried this but it didnt work:

#sidebar ul li.fergcorp_countdownTimer_event_time {
	font-weight:bold;
	color:#C00;
}

Thanks in advance!