Center Titles on Catch adaptive theme

I searched the web, but found no relevant results. I would like to know how can I center and put in bold the post/page title in catch adaptive theme with custom CSS. I’ve tried several CSS codes found online but nothing seems to work with the catch adaptive theme

Thanks!

P.S. I know how to center the tile with HTML tags – but in this case I need to put the HTML tags page by page. I need a solution for the whole site…

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