W3Schools Tryit Editor

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

<header class="w3-container w3-light-grey">
  <h1 class="w3-jumbo">My First W3.CSS Website!</h1>
  <p class="w3-xlarge">This site will grow as we add more ...</p>
</header>

<div class="w3-row-padding">
  <div class="w3-quarter">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
  </div>
  <div class="w3-half">        
  <p><strong>On a large screen the content will be displayed as a 3-column layout. On a small screen the content will adjust itself into a single-column. Resize the browser window to see the effect.</strong></p>
  </div>
  <div class="w3-quarter">        
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
  </div>
</div>

<footer class="w3-container w3-light-grey">
  <p>This is my footer</p>
</footer>

</body>
</html>