Agregar una custom class al body en Wordpress Add custom class to the body in Wordpress
<?php
$id_cat_notas_la_plaza = get_category_by_slug( 'notas-la-plaza-de-tu-mascotas' );
if ( in_category( $id_cat_notas_la_plaza )){
body_class('single-notas-la-plaza-de-tu-mascotas');
}else{
body_class();
}
?>
<body <?php get_template_part('file_name_where_the_last_code_was_wrote'); ?> >