How to create a responsive timeline with CSS?

To create a responsive timeline with CSS, the code is as follows −
Example

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" event="width=device-width, initial-scale=1.0">
<style>
   * {
      box-sizing: border-box;
   }
   body {
      background-color: #9037f5;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif
   }
   h2{
      text-align: center;
   }
   .timeline {
      position: relative;
      max-width: 1200px;
      margin: 0 auto;
   }
   .timeline::after {
      content: " ";
      position: absolute;
      width: 6px;
      background-color: rgb(253, 203, 255);
      top: 0;
      bottom: 0;
      left: 50%;
      margin-left: -3px;
   }
   /* eventsContainer around event */
   .eventsContainer {
      padding: 10px 40px;
      position: relative;
      background-color: inherit;
      width: 50%;
   }
   .eventsContainer::after {
      content: " ";
      position: absolute;
      width: 25px;
      height: 25px;
      right: -17px;
      background-color: rgb(219, 255, 12);
      border: 4px dashed rgb(255, 0, 0);
      background-clip: content-box;
      top: 15px;
      z-index: 1;
   }
   .displayLeft {
      left: 0;
   }
   .displayRight {
      left: 50%;
   }
   .displayLeft::before {
      content: " ";
      height: 0;
      position: absolute;
      top: 22px;
      width: 0;
      z-index: 1;
      right: 30px;
      border: medium solid rgb(225, 246, 255);
      border-width: 10px 0 10px 10px;
      border-color: transparent transparent transparent white;
   }
   .displayRight::before {
      content: " ";
      height: 0;
      position: absolute;
      top: 22px;
      width: 0;
      z-index: 1;
      left: 30px;
      border: medium solid white;
      border-width: 10px 10px 10px 0;
      border-color: transparent white transparent transparent;
   }
   .displayRight::after {
      left: -16px;
   }
   .event {
      padding: 20px 30px;
      background-color: white;
      position: relative;
      border-radius: 6px;
   }
   @media screen and (max-width: 600px) {
      .timeline::after {
         left: 31px;
      }
      .eventsContainer {
         width: 100%;
         padding-left: 70px;
         padding-right: 25px;
      }
      .eventsContainer::before {
         left: 60px;
         border: medium solid white;
         border-width: 10px 10px 10px 0;
         border-color: transparent white transparent transparent;
      }
      .displayLeft::after, .displayRight::after {
         left: 15px;
      }
      .displayRight {
         left: 0%;
      }
   }
</style>
</head>
<body>
<div class="timeline">
<div class="eventsContainer displayLeft">
<div class="event">
<h2>2017</h2>
<h3>Donald Trump became the 45th president of US</h3>
</div>
</div>
<div class="eventsContainer displayRight">
<div class="event">
<h2>2016</h2>
<h3>Summer Olympics are held in rio de Janerio</h3>
</div>
</div>
<div class="eventsContainer displayLeft">
<div class="event">
<h2>2015</h2>
<h3>7.8 Magnitude Earthquake strikes nepal</h3>
</div>
</div>
</div>
</body>
</html>