<!DOCTYPE html>
<html>
<head>
<style type="text/css">
div#box1
{
background-color : Gray;
height:200px;
width : 200px;
overflow : hidden ;
}
</style>
<script type ="text/javascript">
function slideopen(ele) {
var elem = document.getElementById(ele);
elem.style.transition = "height 0.2s linear 0s";
elem.style.height = "200px";
}
function slideclose(ele) {
var elem = document.getElementById(ele);
elem.style.transition = "height 0.2s linear 0s";
elem.style.height = "0px";
}
</script>
<title>Change Background color</title>
</head>
<body>
<button onclick="slideopen('box1');"> slideopen</button>
<button onclick="slideclose('box1');"> slideclose</button>
<div id="box1">Paste your content here</div>
</body>
</html>
<html>
<head>
<style type="text/css">
div#box1
{
background-color : Gray;
height:200px;
width : 200px;
overflow : hidden ;
}
</style>
<script type ="text/javascript">
function slideopen(ele) {
var elem = document.getElementById(ele);
elem.style.transition = "height 0.2s linear 0s";
elem.style.height = "200px";
}
function slideclose(ele) {
var elem = document.getElementById(ele);
elem.style.transition = "height 0.2s linear 0s";
elem.style.height = "0px";
}
</script>
<title>Change Background color</title>
</head>
<body>
<button onclick="slideopen('box1');"> slideopen</button>
<button onclick="slideclose('box1');"> slideclose</button>
<div id="box1">Paste your content here</div>
</body>
</html>
Code generate the following
