জেকুয়েরী slideDown

<!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",
    "display": "none",
  });
  $(".down").click(function(){
    $("div").slideDown(1000);
  });
  $(".up").click(function(){
    $("div").slideUp(1000);
  });
});
</script>
</head>
<body>
<button class="down">নিচে</button>
<button class="up">উপরে</button><br>
<div></div>
</body>
</html>