draw square in div with js and css code example

Example 1: js draw square to canvas

// canvas context.fillRect(x, y, height, width);
ctx.fillRect(20, 20, 150, 100);

Example 2: how to make a rectangle in javascript

const canvas = document.getElementById('pong') // first make a index . html with a canvas height and width and id of pong or whatever
// and then we have to get access to our context to draw on it
const context = canvas.getContext('2d')

// then you do...

context.drawRect(20, 20, 150, 150);
context.fillStyle = '#fff' // thats white!!