contoh flexbox

<!DOCTYPE html>
<html>
<head>
<style>
div.bagian-luar {
  display: flex;
  flex-wrap: nowrap;
  background-color: DodgerBlue;
  flex-direction: row;
}
div.bagian-luar > div.kiri {
  width: 300px;
  background-color: green;
  text-align: center;
  line-height: 75px;
  font-size: 30px;
}
div.bagian-luar > div.tengah {
  width: 400px;
  background-color: red;
  text-align: center;
  line-height: 75px;
  font-size: 30px;
}
div.bagian-luar > div.kanan {
  width: 300px;
  background-color: blue;
  text-align: center;
  line-height: 75px;
  font-size: 30px;
}
</style>
</head>
<body>
<h1>Flexible Boxes</h1>

<div class="bagian-luar">
  <div class="kiri">1</div>
  <div class="tengah">2</div>
  <div class="kanan">3</div>
</div>

<p>Try to resize the browser window.</p>
<p>A container with "flex-wrap: nowrap;" will never wrap its items.</p>
<p><strong>Note:</strong> Flexbox is not supported in Internet Explorer 10 or earlier versions.</p>

</body>
</html>