Format 'Category Description' at top of page

Hi, can you tell me if it’s possible to format the ‘Category Description’ that pulls into the top of each shop category page – it is styled as standard text and I’d like to make it larger and bold:
http://durhamdogs.co.uk/product-category/dog-food – the wording ‘Dog Food’ which appears above the filters and products.
Many thanks, Jen