<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
#wrap {
border: 2px solid;
height: 150px;
width: 300px;
position: relative;
}
#box {
width: 100px;
height: 100px;
background: red;
opacity: 0.3;
position: absolute;
-webkit-transition: left 1s, opacity 1s;
-moz-transition: left 1s, opacity 1s;
-o-transition: left 1s, opacity 1s;
transition: left 1s, opacity 1s;
}
#wrap:hover #box {
opacity: 1;
left: 200px;
height: 150px;
}
</style>
</head>
<body>
<div id="wrap">
<div id="box" class="active"></div>
</div>
</body>
</html>