function setup() {
  createCanvas(400, 400);
  background(255);
  //frameRate(1);
  
}

function draw() {
  for(x = width; x>0; x-=50){
   // stroke(Math.random()* 256, Math.random()* 256,Math.random()* 256);
    circle(width/2, height/2, x);
  }
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.3.1/p5.min.js