JSFiddle - React, Tailwind, and code Playground

JavaScript

var canvas = document.createElement("canvas");
canvas.width = 300;
canvas.height = 300;
 var ctx = canvas.getContext("2d");

 ctx.fillStyle = "rgb(200,0,0)";
 ctx.fillRect (10, 10, 55, 50);

 ctx.fillStyle = "rgba(0, 0, 200, 0.5)";
 ctx.fillRect (30, 30, 55, 50);

document.body.appendChild(canvas);