How can I edit the files to make Social Theme Activity page giv results like BP Default activity pag

I Really like how the BP default 1.2.4 theme lays out the activity page very clearly (with the actual message being seperate from the other text). Im using the Social theme and I woudl like to try and get a similar spacing of text for the activity page. is this something i can just experiment and edit in a file? if it is in the css an dmaybe i just have to add padding? if so , would anyone know which class to do this to? or does each page layout hav their own file to edit?