Mini Shell

<div class="col-md-4">
    <article id="post-<?php the_ID(); ?>" <?php post_class('grid-item'); ?>>
        <?php 
        if ( has_post_thumbnail() ) {
            $thumb_id = get_post_thumbnail_id();
            $thumb_url = wp_get_attachment_image_src($thumb_id,'500x311', true);
            echo '<img src="' . $thumb_url[0] . '" class="img-fluid" />';
        }
        ?>
        <div class="entry-header">
            <?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>
            <div class="entry-meta">
                <?php
                    if ( 'post' === get_post_type() ) :
                        ?>
                        <div class="entry-meta">
                            Publicado em <?php echo get_the_date( get_option( 'date_format' ) ); ?> por <?php the_author(); ?>.
                        </div><!-- .entry-meta -->
                    <?php endif; ?>
            </div><!-- .entry-meta -->
        </div><!-- .entry-header -->

        <div class="entry-content">
            <?php the_excerpt(); ?>
        </div><!-- .entry-content -->

        <footer class="entry-footer">
            <a href="<?php the_permalink(); ?>">Leia mais</a>
        </footer><!-- .entry-footer -->
    </article>
</div>