JSFiddle - React, Tailwind, and code Playground

HTML

<div id="results"></div>
    <input type="button" id="btnRandom" value="Random"/>

JavaScript

var c = 120;
    
    window.addEventListener("load",function(){

       document.getElementById('btnRandom').addEventListener("click",function(){

            //this code goes inside click event function
            var b = c + Math.floor(1 + Math.random() * 10);
            document.getElementById('results').innerHTML= "random: " + b;

       }, false);

    }, false);