Text alignment

Hi, i've done lots of editing in my default template & i find no where to get back my description text alignment, can anyone help me where to locate the file for edit back to normal? sorry for the fuz, very much appreciate,

Thank you,

i'm wondering how to change the add to cart button image, it is so small, i would prefer a wide rectangle one if possible, i tried to replace the image file, but it only show a small tall rectangle, can somebody help me please thank you,