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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<head>
<style>
.mystyle {
  width: 300px;
  height: 50px;
  text-align: center;
  background-color: coral;
  color: white;
  margin-bottom: 10px;
}
</style>
</head>
<body>
​
<p>In this example, we first search for the element in the document with id="myDIV". Then, if this element has a class of "mystyle" - change its font size.</p>
​
<div id="myDIV" class="mystyle">
I am a DIV element
</div>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
  var x = document.getElementById("myDIV");
  
  if (x.className === "mystyle") { 
    x.style.fontSize = "30px";
  }
}
</script>
​
</body>
​
​
​
</html>
​
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