W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style> 
#main {
  width: 400px;
  height: 150px;
  border: 1px solid #c3c3c3;
  display: -webkit-flex; /* Safari */
  display: flex;
}

#main div {
  width: 70px;
  height: 70px;
}

/* Safari 6.1+ */
div#myRedDIV   {-webkit-order: 2;}
div#myBlueDIV  {-webkit-order: 4;}
div#myGreenDIV {-webkit-order: 3;}
div#myPinkDIV  {-webkit-order: 1;}

/* Standard syntax */
div#myRedDIV   {order: 2;}
div#myBlueDIV  {order: 4;}
div#myGreenDIV {order: 3;}
div#myPinkDIV  {order: 1;}
</style>
</head>
<body>

<h1>The order Property</h1>

<p><b>Note:</b> Internet Explorer 10 and earlier versions do not support the order property.</p>

<p><b>Note:</b> Safari 6.1 (and newer) supports an alternative, the -webkit-order property.</p>

</body>
</html>