Paul, thank you for your response. I do use a child theme. All my sites use Genesis Framework with one of their child themes.
I am sorry I am not a coder and need more help in understanding the following.
“If you copy the css block you edit put ‘body’ in in front of the selector and remove all the elements that you don’t change that should work”
For reference to make sure we are both talking about the same thing here is how I use your plugin
https://smallbiz-resources.com/master-head/ by default your plugin has alignment center so in two places I change the word center to left in the shortcode.css file to achieve a left justification