h2 border-top: 10px solid black;

  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
h2 {
 font: bold italic 2em Georgia, Times, "Times New Roman", serif;
 border-bottom: 2px dashed black;
 border-top: 10px solid black;
 margin: 0;
 padding: 0.5em 0 0.5em 0;
 font-size: 1em;
}
p {
 margin: 0;
 padding: 10px 0 0 0;
}

</style>
</head>

<body>
  <h2>Designing Instant Gratification</h2>
  <p>Online, activity of exchanging ideas is sped up. The 
  distribution of messages from the selling of propaganda to the
  giving away of disinformation takes place at a blindingly fast
  pace thanks to the state of technology&hellip;</p>
</body>
</html>

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h2 border-top: 10px solid black; : Header border « Tags « HTML / CSS

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