Glad you liked it :) I uploaded a version that lets you change alpha, but left the default at 1 because I felt it looked the best.
I tried playing around with the alpha values and their behavior is very wonky. According to this:
https://www.factorio.com/blog/post/fff-218
alpha should always be 0.5. But despite this, a Color has a default alpha of 1 if it is not explicitly specified. So that is why I had alpha = 1 before.
