not sure if css or wordpress codex …help??

Hello,

Im new to wordpress, I think there is something wrong w/ my blog design, its because when i put a background color to my blog title .. the whole article is being affected by the background color..

Here’s the code
php code*

<?php get_header(); ?>
<div id="featured"><?php slidedeck( 171 ); ?></div>
<div id="content">

<?php query_posts("posts_per_page=5"); ?>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

<div <?php post_class() ?> id="post-<?php the_ID(); ?>">

<h2 class="post-title"><a>"><?php the_title(); ?></a></h2>

<?php include (TEMPLATEPATH . '/inc/meta.php' ); ?>

<div class="entry">
<?php the_excerpt(); ?>
<div id="read"><a>"> <img src="<?php bloginfo('template_directory'); ?>/images/read-more.jpg" /> </a></div>
</div>

</div>
<?php endwhile; ?>
<!-- <?php include (TEMPLATEPATH . '/inc/nav.php' ); ?> -->
<?php else : ?>

<h2>Not Found</h2>

<?php endif; ?>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>

css**

/**********************************************
Blog Posts
***********************************************/

.post { margin: 0 10px 10px 0; }
.post a { font-weight: normal; }
.post h2, .post h2 a, .post h2 a:hover { border: 0; margin: 0 10px 0 0; }
.post h2 a:hover { text-decoration: underline;}
.meta { color: #000; margin: 5px 0 10px 0; font-size: 9px; font-style: italic;
background: #fafafa; padding: 2px 2px 2px 2px;}

.post-title { color: #000; font-size: 22px; padding: 0; margin: 30px 0 0 0; }
.entry { font-size: 12px; line-height: 20px; display: block; padding: 0 0 40px; 0; float: left; margin: 20px 20px 0 0; font-weight: normal; }
.entry img { margin: 0 10px 5px 0; border: solid black 1px; padding: 1px 1px 1px 1px; }

#read {
float: right;
}

#read a:hover img {
text-decoration: none;
}

#content .separator {
height: 16px;
width: 680px;
background: url(images/separator.jpg);
}

#featured {
padding: 5px;
border-bottom: 5px solid black;
background-color: #fffff;
}

—- like i said. not sure whats happening? help? and if you can improvise it and remove unnecessary codes, kindly do. my coding aint that clean yet.

Thanks a lot