Exercise:

Use the animate() method to set the font-size of <div> to 100 pixels.
The duration of the effect should be "slow".

構文のヒント：$("element").animate({property:"value"},speed);;

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("div").animate({fontSize: "100px"}, "slow");
});
</script>
</head>
<body>

<div style="background:#98bf21;height:200px;width:600px;">Hello World</div>

</body>
</html>