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<!DOCTYPE html>
<html>
<head>
<style>
.flex-container {
  display: flex;
  background-color: DodgerBlue;
}
.flex-container > div {
  background-color: #f1f1f1;
  margin: 10px;
  padding: 20px;
  font-size: 30px;
}
</style>
</head>
<body>
<h1>Create a Flex Container</h1>
<div class="flex-container">
  <div>1</div>
  <div>2</div>
  <div>3</div>  
</div>
<p>A Flexible Layout must have a parent element with the <em>display</em> property set to <em>flex</em>.</p>
<p>Direct child elements(s) of the flexible container automatically becomes flexible items.</p>
</body>
</html>