JSFiddle - React, Tailwind, and code Playground

HTML

<div id="myImg" onClick="changeBg(250,100,50)">
            Click me to set Background image
             background-image:url("https://images.unsplash.com/photo-1541083761663-36980de0d770?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=a626dc2b54af4f665ebe327fb92fc304&auto=format&fit=crop&w=332&q=80");
        </div>

CSS

#myImg
            {
                width:500px;
                height:500px;
                border:1px solid #ccc;
                padding:50px;
            }

JavaScript

function changeBg(red,blue,green)
{
    var imgUrl = "http://www.digitalbiscuits.co.uk/testbed/generateImg/_img.php?r="+red+"&g="+blue+"&b="+green;
        
}