Class for the tag cloud widget

I would like to change the margin of the div that contains the tag cloud in my tag cloud widget.
the tag cloud widget markup looks like this:

<li class="widget">
	<h4>widget title</h4>
	<div>
		the tags are here
	</div>
</li>

The problem with this markup is the div that contains the tags, wich has no id or class for me to point css at it!
I have to create a general css rule for it and then specify other rules to correct all of the other widgets. So how can i have a class for this specific tags div?