<?php
$args=array(
    'category__in' => single_category_id(),
    'post__not_in' => array($post->ID),
    'posts_per_page'=> 4, // Number of related posts that will be shown.
//          'orderby'			=> 'rand',
);
$loop = new wp_query($args);?>
<?php if ( $loop->have_posts() ) : ?>
<div class="member-of">
    <h3 class="normal"> More <?php echo single_category_text();?></h3>
    <div class="row">
            <?php while ( $loop->have_posts() ) : $loop->the_post();?>
                <a href="<?php echo get_permalink();?>" title="<?php the_title();?>">
                    <div class="face col-xs-6 col-md-3 col-lg-3"
                   style="background: url(<?php echo get_the_post_thumbnail_url('','thumbnail');?>) no-repeat center center; background-size:cover;">
                        <div class="info">
                            <?php the_title();?>
                        </div>
                    </div>
                </a>
            <?php endwhile;
            wp_reset_postdata();
            ?>

    </div>
</div>
<?php endif;?>