Processing Random colour and dimension

random.proc

void setup() {
  size(480,120);
}

void draw() {
  
  int[] colours = {255, 100, 10};
  
  if(mousePressed) {
    fill(0);
  }else {
    //fill(255);
    int index = int(random(colours.length)); 
    fill(colours[index]);  
  }
 float random = random(50) + 30; 
  ellipse(mouseX, mouseY,random,random);
}