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  • I have the solution. thanks for your help!!

    <?php if (has_post_thumbnail( $post->ID ) ): ?>
      <?php $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' ); ?>
      <div id="custom-bg" style="background-image: url('<?php echo $image[0]; ?>')">
    
      </div>
    <?php endif; ?>