https://wordpress.stackexchange.com/questions/345052/wp-posts-using-index-php-instead-of-single-php
https://studiopress.community/topic/single-php-for-custom-post-type/
https://forum.tagdiv.com/the-child-theme-support-tutorial/

https://stackoverflow.com/questions/58393087/close-css-only-lightbox-by-clicking-background-without-using-js