Add CCS id and class to....

functions.php

//* Add a CSS ID to main element
add_filter( 'genesis_attr_content', 'custom_attributes_content' );
function custom_attributes_content( $attributes ) {

	if ( is_home() || is_archive() ) {
		$attributes['id'] = 'main-content-area';
	}
	return $attributes;

}

//* Add support for Jetpack infinite scroll
add_theme_support( 'infinite-scroll', array(
	// 'type' => 'click',
	'container' => 'main-content-area',
	'render' => 'genesis_do_loop'
) );

//* Remove archive pagination
// add_action ( 'genesis_after_entry', 'sk_remove_pagination' );
function sk_remove_pagination() {

		remove_action( 'genesis_after_endwhile', 'genesis_posts_nav' );

}