title: CSS scroll down animation process trail line
body: <p>I am new to css animation. I want to make animated scroll down steps process trail line.</p>
  
  <p>for example some what like this "how it works section".  </p>
  
  <p>where should I start ?? what should i search on google.</p>
  
  <p><a href="https://www.societyone.com.au/" rel="nofollow">https://www.societyone.com.au/</a></p>