Например, так:
http://learn.javascript.ru/play/4VShz
<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
.test {
position: relative;
}
.test::after {
background: url(data:image/svg+xml;base64,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);
background: -moz-linear-gradient(top, rgba(255,255,255,0) 0%, rgba(255,255,255,1) 99%, rgba(255,255,255,1) 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,0)), color-stop(99%,rgba(255,255,255,1)), color-stop(100%,rgba(255,255,255,1)));
background: -webkit-linear-gradient(top, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 99%,rgba(255,255,255,1) 100%);
background: -o-linear-gradient(top, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 99%,rgba(255,255,255,1) 100%);
background: -ms-linear-gradient(top, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 99%,rgba(255,255,255,1) 100%);
background: linear-gradient(to bottom, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 99%,rgba(255,255,255,1) 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00ffffff', endColorstr='#ffffff',GradientType=0 );
bottom: 0;
content: '';
height: 20px;
left: 0;
position: absolute;
width: 100%;
}
</style>
</head>
<body>
<div class="test">
Добро пожаловать на javascript.ru!<br>
Здесь живет профессиональный javascript.<br><br>
Цель этого сайта - предоставить как можно более грамотную и структурированную информацию по языку javascript и смежным технологиям.
</div>
</body>
</html>