JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick=zoom(1)>
Zoom In
</button>
<button onclick=zoom(-1)>
Zoom Out
</button>
<div><canvas id="the-canvas" width=640 height=960></canvas></div>

CSS

#the-canvas {
  border: 1px solid #000;
}

JavaScript

// see the code at the bottom of this
// an image URI
var imguri =...