I want to change background image of my wordpress site on particular post type

The WordPress has a very complete Template Hierarchy. For more detailed explanation, visit this article: https://developer.wordpress.org/themes/basics/template-hierarchy/

Basically, to define the layout for this post-type, you can create a file in the theme directory named: single-{post-type}.php

In your example: single-happypost.php

Cheers!

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