Make Woocommerce Long Description Full Width

Hi, I am using the left sidebar on my Woocommerce product page, but have a lot of information to add to the long description and tabs, so I would like to make them the full width of the page (excl. the sidebar).

Is there some code I can use to do this please? Example page:

http://dev.atlasplastics.co.za/shop/huts/ribbed-hut/

I would like the “Description” and “Additional Information” tabs to be the full width of the page (excluding the sidebar – i.e. they mustn’t take up the sidebar space too.)

I have tried everything I can think of – please may you help?

Thanks!