Silly display question

Hi,

OK i know i can use display:none in my css file to stop the blog title etc being displayed but what i’d actually rather do is what this page suggests and put both title and description off screen without altering my css file (incase I want to use h1 in the future).

http://codex.wordpress.org/Designing_Headers

Question is where should i put this command to move the text 1000 pixels to the left? I’ve found the below code in the header is this it? If so what should i write?

<div id=”header”>
<div id=”headerimg”>
<h1>/”><?php bloginfo(‘name’); ?></h1>
<div class=”description”><?php bloginfo(‘description’); ?></div>
</div>

Many thanks

Ben