【border_bottom】
<!DOCTYPE html>
<html>
<head>
<title>input with double-white bottom border</title>
<style type='text/css'>
body {
background: #EEE;
}
input {
background: #f99;
border: 1px solid #CFC8BC;
border-bottom: 3px double #fff;
border-radius: 4px;
}
</style>
</head>
<body>
<input type="text" id="inputName" name="name">
</body>
</html>
