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Theme your user login block! While it isn't always your top priority, customizing the look and feel of the login form helps maintain the integrity of a custom design. In this post, I'll get you started using both CSS and PHP to manipulate the form's elements in Drupal 6 - on the login block. Using CSS to style the Login Block The easiest way to make changes to your login form is with CSS.
Customizing the login form. This seems to be a duplicate (albeit earlier) page Please see which is more recent and more accurate.
Description These snippets allow you to override the default login layout using a custom user_login.tpl.php. If you want to customize the full page layout, click through to the Customizing the login, registration and request password full page layout handbook page.