EDIT
Contents of loop.php as requested in reply :)
<?php if (have_posts()): while (have_posts()) : the_post(); ?> <!-- article --> <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>> <!-- post thumbnail --> <?php if ( has_post_thumbnail()) : // Check if thumbnail exists ?> <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" class="h-entry__image-link"> <?php the_post_thumbnail(array(120,120)); // Declare pixel size you need inside the array ?> </a> <?php endif; ?> <!-- /post thumbnail --> <!-- post title --> <h2 class="p-name"> <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a> </h2> <!-- /post title --> <!-- post details --> <time datetime="<?php the_time('Y-m-j'); ?>" class="dt-published"><?php the_time('jS F Y'); ?></time> <!-- /post details --> <?php html5wp_summary('html5wp_index'); // Build your custom callback length in functions.php ?> <p><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" class="arrow-link">Read the full article</a></p> <?php edit_post_link(); ?> </article> <!-- /article --> <?php endwhile; ?> <?php else: ?> <!-- article --> <article> <h2><?php _e( 'Sorry, nothing to display.', 'html5blank' ); ?></h2> </article> <!-- /article --> <?php endif; ?>