Hi all, don't flame me if this is a wrong section

I am desperately trying to modify the overall appearance of ARMS module. I would like for example to change the color of cells or add border around tables.

I have tried editing index.php, header.php and view.php but changes either do not appear or appear way on top of my pages (outside the template). I use proper coding for this (correct PHP).

Any tips on how to modify/customize this module would be rewarding.