How to convert feature image as background image

please use this code 

<?php $backgroundImg = wp_get_attachment_image_src( 
   get_post_thumbnail_id($post->ID), 'full' );?>

 <div class="header-wrap" style="background: url('<?php echo $backgroundImg[0]; ?>') no-repeat;">

 <header class="entry-header">

 <h1 class="entry-title">
 <?php the_title(); ?>
 </h1>

 </header>

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