HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS ::first-line Background Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      max-width: 32rem;
    }

    .intro {
      font-size: 1rem;
      line-height: 1.65;
      color: #64748b;
    }

    .intro::first-line {
      background-color: #fef9c3;
      color: #713f12;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <p class="intro">
    Learning CSS pseudo-elements opens up powerful typography options without
    changing your HTML structure. Resize the window to see how the highlight
    follows the first visual line.
  </p>
</body>
</html>

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CSS ::first-line - Background Highlight