W3.CSS 둥근 패널

예
<div class="w3-panel w3-blue w3-round-xlarge">
  <p>London is the most populous city in the United Kingdom,
  with a metropolitan area of over 9 million inhabitants.</p>
</div>

[전체소스]
<!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>Rounded Panels</h2>
  <div class="w3-panel w3-blue w3-round-xlarge">
    <p>London is the most populous city in the United Kingdom,
    with a metropolitan area of over 9 million inhabitants.</p>
  </div>
</div>

</body>
</html>