DnD Encounter Calculator

If anyone here plays D&D is aware that most of the tools out there have very difficult interfaces. The ones I struggle with the most are the calculators. This is my attempt to fix it.

Source:https://kastark.co.uk/rpgs/encounter-calculator-5th/

Image source: https://www.hiclipart.com/free-transparent-background-png-clipart-gtjqm