Example 3 - Lime Rounded Rectangle on Red background

// Example 3 - Lime Rounded Rectangle on Red background 

function setup() {

  createCanvas(640, 480);
  background('red');

  stroke('blue');
  strokeWeight(8);
  fill('lime');

  // top radius are 5 and 10 (less rounded)
  // bottom radius are 15 and 20 (more rounded)
  rect(50, 50, 640 - 100, 480 - 100, 5, 10, 15, 20);
}

Output: