@PointPubMedia the hour and the minute are in the same div which makes it not possible to do it just in css, but
there is a config option which adds a wrapper around the minutes, which is perfect for this task.
the selector would be probably something like this:
.clock div.time.bright.large.light span.bold { //set the font size here }therefore you also have to add clockBold: true to the config
if you dont like the bold effect you can overwrite it as well where you change the font size