Can you try this:
textarea:focus, input[type=text]:focus, input[type=password]:focus, input[type=datetime]:focus, input[type=datetime-local]:focus, input[type=date]:focus, input[type=month]:focus, input[type=time]:focus, input[type=week]:focus, input[type=number]:focus, input[type=email]:focus, input[type=url]:focus, input[type=search]:focus, input[type=tel]:focus, input[type=color]:focus {
-webkit-box-shadow: inset 0px 0px 2px #540C69;
-moz-box-shadow: inset 0px 0px 2px #540C69;
}
?
Use a CSS3 generator for the box shadows http://css3generator.com/