“How to customize animations on AOS Library?”
AOS Library (by michalsnik) is a great way to trigger animation while scroll for your website design. Here’s how to customize animations using AOS library.
Add CSS to your website header
<link rel="stylesheet" href="https://unpkg.com/aos@next/dist/aos.css" />
Add JS at the end of body tag 
<script src="https://unpkg.com/aos@next/dist/aos.js"></script>  
<script type="text/javascript">
AOS.init({   
});
</script> 
HTML
<div class="box" data-aos="my-animation-1">1</div> <div class="box" data-aos="my-animation-2">2</div> <div class="box" data-aos="my-animation-3">3</div> <div class="box" data-aos="my-animation-1">4</div> <div class="box" data-aos="my-animation-2">5</div> <div class="box" data-aos="my-animation-3">6</div> <div class="box" data-aos="my-animation-1">7</div> <div class="box" data-aos="my-animation-2">8</div> <div class="box" data-aos="my-animation-3">9</div>
CSS
/* Default Style of Boxes */
.box {
  width: 250px;
  height: 250px;
  margin: 2rem auto; 
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family:sans-serif;
  font-size: 5rem;
  color: #FFF;
}
 
/* Before of Animation 1 */
[data-aos="my-animation-1"] {
  transform: rotate(0deg);
  background: black;
  opacity: 0; 
}
/* After of Animation 1 */ 
[data-aos="my-animation-1"].aos-animate {
  transform: rotate(360deg); 
  opacity: 1; 
}
	
/* Before of Animation 2 */
[data-aos="my-animation-2"] {
  background: black;
  transition-property: background; 
}
/* After of Animation 2 */
[data-aos="my-animation-2"].aos-animate {
  background: cyan; 
}
	
/* Before of Animation 3 */
[data-aos="my-animation-3"] {
  transform: translateX(-100%);
  opacity: 0; 
}
/* After of Animation 3 */
[data-aos="my-animation-3"].aos-animate {
  transform: translateX(0%); 
  background: purple;
  opacity: 1; 
}
DEMO: How It Looks
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