ACF slick slider

acf_slick.php

<?php if( have_rows('billboard') ): ?>
    <div class="billboard">
          <?php while( have_rows('billboard') ): the_row();
                  $imageArray = get_sub_field('image');
                  $imageURL = $imageArray['url'];
          ?>
        
            <div class="slide-item" style="background-image: url('<?php echo $imageURL;?>');" >
                <h1><?php the_sub_field('title'); ?></h1>
            </div>

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