JSFiddle - React, Tailwind, and code Playground
HTML
<canvas id="canvas" width="150" height="150" />
CSS
canvas {
border: solid black 1px;
width: 400px;
height: 600px;
}
JavaScript
var canvas = document.getElementById("canvas");
if (canvas.getContext) {
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);
}