Menus?

Hi All,

Currently i’m developing a simple site for a customer of mine and he wants the menu image to span the whole length of the site but when i’ve done 100% it moves the text across also.

Is there a way to keep the menu central and just add the image as dynamic as the side is fluid.

Heres the code from my css and footer.php

css

/*-----------------------------------------------------------------------------------*/
/*	07.	Prefooter
/*-----------------------------------------------------------------------------------*/

#prefooter {
	text-align: center;
	padding-bottom: 36px;
}
#prefooter-inner {
	width: 980px;
	padding: 35px 0 0 0;
	margin: 0 auto;
	text-align: left;
	position: relative;
}

/*-----------------------------------------------------------------------------------*/
/*	08.	Footer
/*-----------------------------------------------------------------------------------*/

#footer-border{
	height: 2px;
}
#footer-inner {
	width: 980px;
	padding: 0;
	margin: 0 auto;
	font-size: 11px;
	overflow: hidden;
	background: url(https://ecocomm.aurahost.co.uk/wp-content/uploads/2014/01/footer.png);
}

Footer.php

</div>
	<!-- END #CONTENT-INNER -->
	</div>
	<!-- END #CONTENT-WRAPPER -->
    <?php
        get_template_part( 'content','prefooter' );
    ?>
	<!-- FOOTER -->
	<footer>
		<div id="footer-border"></div>
		<div id="footer-inner">
			<span class="alignleft">
			Copyright &copy; <?php echo date('Y'); ?> <strong><a href="<?php echo home_url( '/' ); ?>"><?php bloginfo( 'name' ); ?></a></strong>
			<div id="site-generator">

				<small><?php _e('Proudly powered by', 'gamepress'); ?> <a href="https://www.ads-software.com" target="_blank"><?php _e('WordPress', 'gamepress'); ?></a>. <a href="https://webtuts.pl/themes/" title="<?php _e('GamePress', 'gamepress'); ?>" target="_blank"><?php _e('GamePress', 'gamepress'); ?></a></small>

			</div><!-- #site-generator -->
			</span>
			<span class="alignright"><a href="#" class="scrollup"><?php _e('BACK TO TOP','gamepress'); ?> &uarr;</a></span>
		</div>
		<!-- END #FOOTER-INNER -->
	</footer>
	<!-- END FOOTER -->
</div>
<!-- END #PAGE -->
<?php wp_footer(); ?>
</body>
</html>