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<!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/5/w3.css">
<body class="w3-container">
<form class="w3-panel w3-card-4" action="/action_page.php">
  <h2>Input Form</h2>
  <p><input class="w3-input" type="text" placeholder="Name"></p>
  <p><input class="w3-input" type="text" placeholder="Email"></p>
  <p><textarea class="w3-input" placeholder="Subject"></textarea></p>
  <p><button class="w3-btn w3-black">Register</button></p>
</form>
</body>
</html>