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<!DOCTYPE html>
<html>
<head>
<style> 
#main {
  width: 400px;
  height: 150px;
  border: 1px solid #000000;
  display: flex;
}
#main div {
  width: 70px;
  height: 70px;
}
</style>
</head>
<body>
<h1>Change order with JavaScript</h1>
<div id="main">
  <div style="background-color:coral;" id="myRedDIV"></div>
  <div style="background-color:lightblue;" id="myBlueDIV"></div>
  <div style="background-color:lightgreen;" id="myGreenDIV"></div>
  <div style="background-color:pink;" id="myPinkDIV"></div>
</div>
<p>Click the "Try it" button to change the order of the four DIV's:</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  document.getElementById("myRedDIV").style.order = "4";
  document.getElementById("myBlueDIV").style.order = "3";
  document.getElementById("myGreenDIV").style.order = "1";
  document.getElementById("myPinkDIV").style.order = "2";
}
</script>