Add GeneratePress Element Class to body tag

gp-element-class.php

<?php
add_filter( 'body_class', function( $classes ) {
    global $generate_elements;
    foreach ( $generate_elements as $element => $data ) {
        $element_title = 'gp-elem-' . strtolower(str_replace(' ', '-', get_the_title( $data['id'] ) ));
        $classes[] = $element_title;
    }
    return $classes;
});

In GeneratePress premium, add a class to the body tag for each element on page.