Answers for "onscroll animation"

aos js

CSS
<link href="https://unpkg.com/[email protected]/dist/aos.css" rel="stylesheet">

JS
<script src="https://unpkg.com/[email protected]/dist/aos.js"></script>

INITIALIZE AOS:
<script>
  AOS.init();
</script>

animate on scroll

<!---Add script right before closing </body> tag, and initialize AOS:--->

  <script src="https://unpkg.com/aos@next/dist/aos.js"></script>
  <script>
    AOS.init();
  </script>