HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .filter('.middle')</title>
  <style>
    div { width: 60px; height: 60px; margin: 5px; float: left; border: 2px white solid; }
  </style>
</head>
<body>
  <div></div><div class="middle"></div><div></div>
  <div class="middle"></div><div></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("div")
      .css("background", "#c8ebcc")
      .filter(".middle")
      .css("border-color", "red");
  </script>
</body>
</html>

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jQuery .filter('.middle') — div demo (Try It)