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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/4/w3.css">
<body class="w3-container">
<h2>Hover Border Color</h2>
<p>All border colors can be used as hoverable border classes:</p>
<div class="w3-panel w3-border w3-hover-border-red">
  <p>Hover border red</p>
</div>
<div class="w3-panel w3-border w3-hover-border-green">
  <p>Hover border green</p>
</div>
<div class="w3-panel w3-border w3-hover-border-blue">
  <p>Hover border blue</p>
</div>
<div class="w3-panel w3-border w3-hover-border-black">
  <p>Hover border black</p>
</div>
</body>
</html>