Wordpress Single Category Posts

<div class="col-md-8 happer_new">
         
               <?php  
$loop = new WP_Query( array('post_type' => 'home', 'home_category' => 'happy', 'posts_per_page' => 1 ) );
while ( $loop->have_posts() ) : $loop->the_post();
$postid = get_the_ID();
$thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'thumbnail_size' );
$url = $thumb['0'];
?>
   
            <h3 class="happier"><?php echo the_title();?></h3>
            <div class="col-md-4 nopaddding"> <?php echo the_post_thumbnail();?> </div>
            <div class="col-md-8">
           
            <?php echo the_content();?>
           
            </div>
           
              <?php endwhile;?>
          </div>