round corner border

Hello
(after one member of wordpress forum send me these codes, I can’t make it working ….)

I have add this css with html code files (css and page.php) of default Kubrick v1.5 wordpress theme..

http://istud.free.fr/divers/RoundedBoxesCode.txt

it doens’t work.. i don’t know where I make mistake

the site I want this rounded corner here:
http://1fomedia.free.fr

– my css file modified:
http://1fomedia.free.fr/wp-content/themes/atm-studio/style.css

– my html I want to do:
<?php get_header(); ?>

<div id=”content” class=”narrowcolumn”>

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div class=”post” id=”post-<?php the_ID(); ?>”>
<h2><?php the_title(); ?></h2>
<div class=”entrytext”>
<?php the_content(‘<p class=”serif”>Read the rest of this page »’); ?>
<?php link_pages(‘Pages: ‘, ”, ‘number’); ?>

</div>
</div>
<?php endwhile; endif; ?>
<!–<?php edit_post_link(‘Edit this entry.’, ”, ”); ?>–>
</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

anybody can help me?

regards,