Get featured image as background, not working?

CMS & WordPress
1

I want to use a thumbnail (featured image) as background but I can’t get it to work, I have googled and found something that worked for other people but not for me, guess I am doing something wrong.

Here is my code

<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

	<?php
	$src = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), array( 5600,1000 ), false, '' );
	?>

	<div id="start" style="background: url(<?php echo $src[0]; ?>) !important; background-size: cover; background-position: center;">
		<div class="table">
			<div class="table-cell">
				<div class="inner row">
					<div class="large-12 columns">

						<?php the_content(); ?>

					</div>
				</div>
			</div>
		</div>
	</div>

	<?php endwhile; endif; ?>
2

Is it not showing up at all? Can you give us a live link to look at? Are you sure the image path is correct?