Move Widget Title and Color

I have added an image to all my sidebars in which the widget title will be placed. However I need change the widget color and text size to fit in the image. I also need to separate the title from the rest of the text. Where can I find the script for the widgets so I can find what code I need? If this doesn’t make sense go to https://www.barrel-roll.com and look at the right sidebars. It should help. Thanks