Result Size: 625 x 664
x
 
<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>
<div class="w3-container">
  <h2>Dynamic Progress Bar</h2>
  <div class="w3-light-grey">
    <div id="myBar" class="w3-green" style="height:24px;width:0"></div>
  </div>
  <br>
  <button class="w3-button w3-green" onclick="move()">Click Me</button> 
</div>
<script>
function move() {
  var elem = document.getElementById("myBar");   
  var width = 1;
  var id = setInterval(frame, 10);
  function frame() {
    if (width >= 100) {
      clearInterval(id);
    } else {
      width++; 
      elem.style.width = width + '%'; 
    }
  }
}
</script>
</body>
</html>