Hi i have used this code
<?php
$elements = drupal_get_form("user_login");
$form = drupal_render($elements);
echo $form;
?>
to get the default Drupal login form for my site but I need to customize the HTML, I have found some pages in module/users but did not understand how to customize the structure.
use this in template.php
function themename_theme() {
$items = array();
$items['user_login'] = array(
'render element' => 'form',
'path' => drupal_get_path('theme', 'corporateclean') . '/templates',
'template' => 'user-login',
);
and create a template folder and within that create a file user-login.tpl.php and in this file you can put your html and could customize drupal login