<div class="box green"></div>
<div class="box orange"></div>
<div class="box grey"></div>
<div class="box green"></div>
<div class="box orange"></div>
<div class="box grey"></div>
<div class="box green"></div>
<div class="box orange"></div>
<div class="box grey"></div>

/* Global styles come from external css https://codepen.io/GreenSock/pen/JGaKdQ*/

body {
  margin-top: 50px;
  text-align: center;
}

.box {
  display: inline-block;
  margin-right: 5px;
}

.pink {
  background-color: pink;
}

var colors = ["#3498db", "#27ae60", "#f1c40f"];
gsap.to(".box", {
  delay: 0.5,
  duration: 1,
  backgroundColor: function(i, elem, boxes) {
    return colors[i % 3];
  }
});