Set class if a meta value is set within post archive

i suggest you check the the value of $checkbox by either checking checkbox under meta_key column in wp_postmeta or *your prefix_postmeta table in your database or simply do var_dump($checkbox); for testing if its 0 or null or an empty string or so then your if condition will not return true and $has_video will not be assigned to ‘icon-has_video’.

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