W3Schools Tryit Editor

Get your own website

<!DOCTYPE html>
<html lang="en">
<title>W3.CSS</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/6/w3.css">
<body class="w3-container">

<h2>The flex-flow Property</h2>
<p>The <b>flex-flow</b> property is shorthand for <b>flex-direction</b> and <b>flex-wrap</b>.</p>

<div class="w3-flex" style="flex-flow:row wrap">
  <div class="w3-container w3-green"><h3>1</h3></div>
  <div class="w3-container w3-green"><h3>2</h3></div>
  <div class="w3-container w3-green"><h3>3</h3></div>
  <div class="w3-container w3-green"><h3>4</h3></div>
  <div class="w3-container w3-green"><h3>5</h3></div>
  <div class="w3-container w3-green"><h3>6</h3></div>
  <div class="w3-container w3-green"><h3>7</h3></div>
  <div class="w3-container w3-green"><h3>8</h3></div>
  <div class="w3-container w3-green"><h3>9</h3></div>
  <div class="w3-container w3-green"><h3>10</h3></div>
  <div class="w3-container w3-green"><h3>11</h3></div>
  <div class="w3-container w3-green"><h3>12</h3></div>
</div>

</body>
</html>