Sorry in advance, but how do you make a map on atlas and post it on the forum in a post? I think the original poster is pretty close to what the end map will look like as well.
Go here :
https://uselectionatlas.org/TOOLS/evcalc.phpWhen you are done manipulating the settings for your custom map, hit the "Show Map Link" button near the bottom of the page.
Verify that the image of the map, which appears near the bottom of the page, is exactly what you want. If you make a mistake, do your corrections and then hit the button again.
When satisfied, copy and paste the internal-Atlas image code that is displayed (I think a small new window appears).