fillStyle

by aio350

HTML

<canvas width="300" height="300" style="border: 1px dotted #222"></canvas>

CSS

body {
  margin: 0;
  height: 100vh;
  background: radial-gradient(circle, skyblue, steelblue);
  display: flex;
  justify-content: center;
  align-items: center;
}

JavaScript

const canvas = document.querySelector('canvas')
const $ = canvas.getContext('2d')

for (let i = 0; i < 6; i++) {
  for (let j = 0; j < 6; j++) {
    $.fillStyle = `rgb(${Math.floor(255 - 42.5 * i)}, ${Math.floor(255 - 42.5 * j)}, 0`
    $.fillRect(j * 50, i * 50, 50, 50)
  }
}