<!DOCTYPE HTML>
<html>
<head>
<style>
html {
background: white;
}
div {
background: -moz-linear-gradient(left, 0 white, 100% orange);
background: linear-gradient(left, 0 white, 100% orange);
height: 100px;
width: 50%;
</style>
</head>
<body>
<div></div>
</body>
</html>