HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>enter leave pair</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    .card {
      display: inline-block; width: 140px; padding: 16px; margin-right: 10px;
      border: 1px solid #e2e8f0; border-radius: 8px; background: #f8fafc;
      transition: box-shadow 0.15s, border-color 0.15s;
    }
    .card.highlight { border-color: #6366f1; box-shadow: 0 4px 16px rgba(99,102,241,0.25); background: #eef2ff; }
    #hint { color: #64748b; font-size: 14px; margin-top: 12px; }
  </style>
</head>
<body>
  <div class="card">Card A</div>
  <div class="card">Card B</div>
  <div class="card">Card C</div>
  <p id="hint">mouseenter adds .highlight — mouseleave removes it.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(".card")
      .on("mouseenter", function() {
        $(this).addClass("highlight");
      })
      .on("mouseleave", function() {
        $(this).removeClass("highlight");
      });
  </script>
</body>
</html>

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jQuery mouseleave — enter + leave highlight (Try It)