<!DOCTYPE html>
<html>
<head>
<title>background-size: 25% auto;</title>
<style type="text/css">
#outer
{
border: 1px solid black;
width: 64px;
height: 128px;
}
#inner
background-image: url(aqua-32x32.png);
background-repeat: no-repeat;
background-size: 25% auto;
</style>
</head>
<body>
<div id="outer"><div id="inner"></div></div>
</body>
</html>