জেকুয়েরী delay

<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
<script>
$(document).ready(function(){
  $("div").css({
    "width": "50px",
    "height": "50px",
    "background-color": "pink",
  });
  $(".start").click(function(){
    $("div").fadeOut(500).delay(1000).fadeIn(500);
  });
});
</script>
</head>
<body>
<button class="start">চালু</button><br>
<div></div>
</body>
</html>