JSFiddle - React, Tailwind, and code Playground

HTML

<span>+: </span><input type="range" id="plus"><br>
<span>-: </span><input type="range" id="minus"><br>
<span>=: </span><span id="equals">0</span>

CSS

* {
    font-family: monospace;
}

JavaScript

var plus = document.querySelector("#plus");
var minus = document.querySelector("#minus");
var equals = document.querySelector("#equals");

plus.onchange = minus.onchange = function()
{
    equals.innerText = plus.value - minus.value;
}