styling a tag cloud – center tags

I would like to center my tag cloud, as apposed to be aligned left..

If I wanted to style it in the plugin:

Edit this array in order to change the tag could appearance
see http://codex.wordpress.org/Template_Tags/wp_tag_cloud for details
$gtags_args = array( ’smallest’ => 9, ‘largest’ => 20, ‘number’ => 36, ‘orderby’ => ‘count’, ‘order’ => ‘DESC’, ’separator’ => ‘&nbsp ‘ );

Any idea’s on how I could achive this?