Try it Yourself: jQuery Fade

jQuery Fade

<!DOCTYPE html>
<html>
<head>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
</head>
<body>

<button id="showBtn">Show</button>
<button id="hideBtn">Hide</button>
<div id="box" style="display:none; width:100px; height:100px; background-color:tomato;"></div>

<script>
$("#showBtn").click(function() {
  $("#box").fadeIn("slow");
});

$("#hideBtn").click(function() {
  $("#box").fadeOut(1000);
});
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<head>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
</head>
<body>

<button id="showBtn">Show</button>
<button id="hideBtn">Hide</button>
<div id="box" style="display:none; width:100px; height:100px; background-color:tomato;"></div>

<script>
$("#showBtn").click(function() {
  $("#box").fadeIn("slow");
});

$("#hideBtn").click(function() {
  $("#box").fadeOut(1000);
});
</script>

</body>
</html>