Frame for pictures

Hi, can you please help me? I use the themes and film Fil Bizpress - paid - and would like the images in my articles with a gray frame provided and create a distance to the text.
What code do I need to file in which to insert both themes? I am delighted with feedback, Marion

Hi!
There are several css files: style.css located in the directory of the theme and the others inside /css folder. Inspecting the page you will be able to find the line and the file you have to edit. We don't provide such kind of services.