Provide feedback to users or visitors with basic feedback states on form controls and labels.
We remove the default outline styles on some form controls and apply a box-shadow in its place for :focus.
<!DOCTYPE HTML>
<html>
<head>
<link href="http://java2s.com/style/bootstrap.min.css" rel="stylesheet">
</head><!-- w ww. j ava 2s .com-->
<body style='margin:20px;'>
<form class="form-horizontal">
<input class="form-control" id="focusedInput" type="text" value="This is focused...">
</form>
</body>
</html>