Get post slug from post wordpress

In this post, I will try create dynamic class css from slug post using easy post oxygen builder. I have layout like in below, so I will add slug from post as class css

<div class='oxy-post <?php $postId = get_the_ID(); $slug = basename(get_permalink($postId)); echo $slug; ?>'>
    <div class='goal-heading'>
        <?php 
            $image = get_field('goals_icon_outline');
            if( !empty($image) ): 
        ?>
        <div class='goal-icon'>
            <img src="<?php echo $image['url']; ?>" alt="<?php echo $image['alt']; ?>" class="ct-image" />
        </div>
        <?php endif; ?>
        <a class='oxy-post-title' href='<?php the_permalink(); ?>'><?php the_title(); ?></a>
    </div>
    <div class='oxy-post-image'>
        <img src="<?php echo get_the_post_thumbnail_url(); ?>" class="ct-image" />
    </div>
     <div class='oxy-inner'>
        <h5><?php the_field('tagline'); ?></h5>
        <?php the_excerpt(); ?>
    </div>
</div>

Resources: https://stackoverflow.com/questions/33842251/how-to-get-post-slug-from-post-in-wordpress