<div style="background-image: url('<?php echo get_the_post_thumbnail_url(get_the_ID(),"full"); ?>'); background-size: contain; background-repeat: no-repeat; background-position: center center; height: 400px;"></div>
<!-- VEYA -->
<img src="<?php echo get_the_post_thumbnail_url(get_the_ID(),"full"); ?>" />