Styling CI form_input

[eluser]doubleplusgood[/eluser]
Hi,

I tried the way from the user guide first, but it gave an undefined variable error.

Using the following code in the view;

Code:

<?=form_input($data);?>

and the following code in controller;

Code:

$data = array(
                'name' => 'last_name',
                'class' => 'text',
                'value' => 'last_name');