void setup () {
  size (1000, 700);
  for (int i = 0; i < 100; i++) {
    float a = random(0, 255);
    float b = random(0, 255);
    float c = random(0, 255);
    background (a, b, c);
  }
}

void draw () {

  noCursor ();

  for (int i = 0; i < 100; i++) {
    float a = random(0, 255);
    float b = random(0, 255);
    float c = random(0, 255);
    float d = random(0, width);
    float e = random(0, height);   
    noStroke (); 
    fill (a, b, c, 2);
    rectMode (CENTER);
    rect (mouseX, mouseY, d, e); 
  }


}

void mousePressed () {
  for (int i = 0; i < 100; i++) {
    float a = random(0, 255);
    float b = random(0, 255);
    float c = random(0, 255);
    background (a, b, c);
  }
}