Dropdown widths for characteristics dropdown

-- url of the page with the problem -- : www.audleymotors.co.uk/cleaning-car-care...ing-polish-dark-grey
-- HikaShop version -- : 2.2.1
-- Joomla version -- : 3.1.5
-- PHP version -- : 5.4

I'm trying to change the dropdown width of the characteristics dropdown - I managed to change the width of the dropdown box, but now need to change the width of the list (if you click it you'll see it's wider than the box). I see that there are in-line style elements:

<div class="chzn-drop" style="display: block; width: 218px; top: 24px;"><div class="chzn-search">

I can't find the view that I can over-ride these in-line elements, do you know where it is?

Thanks

Of course, sorry I didn't see the obvious lol