JSFiddle - React, Tailwind, and code Playground

HTML

<div></div><div></div>

CSS

div {
 width: 50px;
height: 50px;    
}

JavaScript

function toColor(num) {
    num >>>= 0;
    var b = num & 0xFF,
        g = (num & 0xFF00) >>> 8,
        r = (num & 0xFF0000) >>> 16,
        a = ( (num & 0xFF000000) >>> 24 ) / 255 ;
    return "rgba(" + [r, g, b, a].join(",") + ")";
}
var a = toColor(-5952982);

var b = toColor(-12525360);

$("div").eq(0).css("background-color", a );
$("div").eq(1).css("background-color", b );