Backend User Edit

I have made some headway into setting up my own Tab and new Fields. Is there a way I can change the width given to the labels for the fields as they are a little squashed. See screen shot. I have loads of space to the right, but the labels seems to be crammed into a narrow column.

Inspect your page with Firebug to see which css from your template is influencing this and adjust it in your template css code.