Add Class Attributes to Front Page in Genesis Sample

class-attributes-front-page-genesis-sample.php

// Add attributes for site-inner element, since we're removing 'content'.
function be_site_inner_attr( $attributes ) {
    // Add a class of 'full' for styling this .site-inner differently
    $attributes['class'] .= ' full';

    // Add the attributes from .entry, since this replaces the main entry
    $attributes = wp_parse_args( $attributes, genesis_attributes_entry( array() ) );
    return $attributes;
}
add_filter( 'genesis_attr_site-inner', 'be_site_inner_attr' );