<html>
<head>
<style type="text/css">
form input[type=text]{
width:100px;
}
.test{
width:200px;
}
</style>
</head>
<body>
<form>
<input type="text" />
<div><input type="text" class="test" /></div>
</form>
</body>
</html>
form .test input{
width:200px;
} 
