RE: Splinterlands Battle Simulator

Hey, this tool is pretty cool, what did you use to make it?
It would greatly help to have UI improvements like being able to swap just the summoner out, or moving positions as well, or making the font the same as the one ingame. I'm very familiar with HTML/JS/CSS but not most of the frameworks so I was wondering if those skills could help.
The winrate also seems to vary when you click the button again, it'd be better if the winrate was averaged together (if you click the button 3 times on the same army the winrate showed should be the winrate of all those matches it simulated).