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.home .site-inner {
	max-width: none;
	padding-top: 0;
}

<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

<!-- front-page.php: -->

<?php
/**
 * Front Page with full width sections.
 *
 * @author      Sridhar Katakam
 * @license      GPL-2.0+
 */

/**
 * Homepage Content
 *
 */
function sk_homepage_content() {
    echo "string";
}
add_action( 'sk_content_area', 'sk_homepage_content' );

// Remove 'site-inner' from structural wrap
add_theme_support( 'genesis-structural-wraps', array(
    'header',
    'nav',
    'subnav',
    // 'site-inner',
    'footer-widgets',
    'footer'
) );
 
// Build the page
get_header();
do_action( 'sk_content_area' );
get_footer();