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html, body{
  width: 100%;
  height: 100vh;
  margin: 0;
  margin-left: 1%;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: start;
  overflow: hidden;
}
// random number helper function
const random = (min, max) => {
    return Math.floor(Math.random() * ( max - min ) + min);
};

// classes for balls
const balls = ['.red', '.yellow', '.pink', '.purple', '.blue', '.green']

// for each color ball
balls.forEach( (color) => {
    let x = random(-200, 200);
    let y = -random(0, 200);
    gsap.fromTo(color, {
        y: y,
        x: x,
        visibility: 'visible',
    }, {
        y: 0,
        x: 0,
        ease: Bounce.easeOut,
        duration: 1.5,
        opacity: 1,
        stagger: 0.1,
    });
})

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/gsap/3.3.4/gsap.min.js