Centre blog list and category page and change the category text of 'Posts in X'

Hi, how do I centre blog list content and category pages and change the text, font and size of 'Posts in X' to eg 'Rooms with a capacity of X' https://renfield-centre.squarespace.com/rooms/category/200
PW: renfield

Thanks
Pete

Can you check it again? I don't see the text Posts in

4 hours ago, tuanphan said:

Can you check it again? I don't see the text Posts in

It's showing now