size(400,400);
background(255,255,255);
ellipseMode(CENTER_DIAMETER);
noStroke();
smooth();


fill(255,200,0, 100);
ellipse(50,150, 55,200);

fill(0,255,0, 100);
ellipse(120,150, 100,150);

fill(0,0,255, 150);
ellipse(200,150, 100,100);