CSS - Measurement Units

<!DOCTYPE html>
<html>
<head>
  <style>
    .text-2vw {
      font-size: 2vw;
    }
    
    .text-4vw {
      font-size: 4vw;
    }
    
    .text-6vw {
      font-size: 6vw;
    }
  </style>
</head>
<body>
  <h1 class="text-2vw">This is a 2vw font size</h1>
  <h2 class="text-4vw">This is a 4vw font size</h2>
  <h3 class="text-6vw">This is a 6vw font size</h3>
</body>
</html>

CSS - Measurement Units

Example -Demo vw unit