let radius = 20;

let canW = 400;

let canH = 400;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(250);

}

​

function draw() {

  x = random(0,width);

  y = random(0,height);

  r = random(0,255);

  g = random(0,255);

  b = random(0,255);

  a = random(0,255);

  radius = random(16, 28)

  strokeWeight(0);

  fill(r,g,b,a);

  circle(x,y,radius);

}