Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("#btn1").click(function(){
        $("#box").animate({height: "300px"});
    });
    $("#btn2").click(function(){
        $("#box").animate({height: "100px"});
    });
});
</script>
</head>
<body>

<button id="btn1">Animate height</button>
<button id="btn2">Reset height</button>

<div id="box" style="background:#98bf21;height:100px;width:100px;margin:6px;"></div>

</body>
</html>