Wrapper Background not showing up

Good evening! I have looked thru the forum to find a solution for my problem, but I couldnĀ“t find one.
I have a wrapper background on my index.php but its not showing up

<?php get_header(); ?>
 
<div id="page">
<!--Inhalt-->   
<strong><div id="wrapper"></strong>
 
<div id="left-sidebar"><?php include (TEMPLATEPATH . '/sidebar.php'); ?></div>
 
<!--post-->
<?php query_posts($query_string.'&cat=-3&&order=DESC'); 
while (have_posts()) : the_post(); ?>
<div class="entry" id="post-<?php the_ID(); ?>"><div id="headerentry">

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