I am not quite sure how to word this but here it goes.
On my home page which displays blog previews the content is full width: http://stuartjones.me/
I did this by setting all the pages to full width and without a side bar.
When I select a category e.g. Cardiff University: http://stuartjones.me/category/cardiff-university-work/ it changes it to about 3/4 of the page. How can I change the category template so it looks like the home page?