The easiest way is to edit the "Frame Style:" field before generating
your clock.
Default it contains this:
width:15.6em;height:22.8em;
You could make it smaller by changing it to this:
width:10em;height:14em;
Another possibility is to surround the generated code with your own
<div> and then change the styling of that div to make font-size
smaller, as the clock iframe is sized in relation to the font size of
the element it is embedded in.
Otto