I needed a simpler right triangle mixin. I borrowed the idea from: http://codeitdown.com/css-triangles-responsive/
A SVG version of the logo is available at: https://commons.wikimedia.org/wiki/File:Elm_logo.svg
The spacing is close, but not exact. It would take a little bit of fussing in order to get the spacing spot on ... I just didn't have the time.
This reminded me one of my favorite games Tangoes - https://www.amazon.com/Tangoes-T100-Classic/dp/B00000K3BU/ref=sr_1_2?ie=UTF8&qid=1490577749&sr=8-2&keywords=tangoes