W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>

<div class="w3-container">
  <h2>Grid</h2>
  <p>The w3-row class creates a mobile-first responsive grid system.</p>
</div>

<div class="w3-row">
<div class="w3-third w3-container">
<p>
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</p>
</div>

<div class="w3-third w3-container">
<p>
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</p>
</div>

<div class="w3-third w3-container">
<p>
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</p>
</div>
</div>

<div class="w3-container w3-deep-orange">
<p>Resize the window to see the fluid grid in effect</p>
</div>

</body>
</html>