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.site-inner {
  max-width: none;
}

/*Extra float clearing*/
.content-sidebar-wrap:before {
	content: " ";
	display: table;
}

.content-sidebar-wrap:after {
	clear: both;
	content: " ";
	display: table;
}

<?php

//Move Header into Site-Inner
function themeprefix_header_site_inner() {
	//Reposition the primary navigation menu
	remove_action( 'genesis_after_header', 'genesis_do_nav' );
	add_action( 'genesis_before_content', 'genesis_do_nav', 5 );

	 //Reposition Header Content
	remove_action( 'genesis_header', 'genesis_header_markup_open', 5 );
	remove_action( 'genesis_header', 'genesis_do_header' );
	remove_action( 'genesis_header', 'genesis_header_markup_close', 15 ) ;
	add_action( 'genesis_before_content_sidebar_wrap', 'genesis_header_markup_open', 5 );
	add_action( 'genesis_before_content_sidebar_wrap', 'genesis_do_header' );
	add_action( 'genesis_before_content_sidebar_wrap', 'genesis_header_markup_close', 15 );
}
add_action( 'genesis_before', 'themeprefix_header_site_inner' );

//Move Footer in Site Inner
function themeprefix_footer_site_inner() {
	//Reposition the footer widgets content
	remove_action( 'genesis_before_footer', 'genesis_footer_widget_areas' );
	add_action( 'genesis_after_content_sidebar_wrap', 'genesis_footer_widget_areas', 4); //Priority 4 trumps below footer markup

	//Reposition the footer content
	remove_action( 'genesis_footer', 'genesis_footer_markup_open', 5 );
	remove_action( 'genesis_footer', 'genesis_do_footer' );
	remove_action( 'genesis_footer', 'genesis_footer_markup_close', 15 );
	add_action( 'genesis_after_content_sidebar_wrap', 'genesis_footer_markup_open', 5 );
	add_action( 'genesis_after_content_sidebar_wrap', 'genesis_do_footer' );
	add_action( 'genesis_after_content_sidebar_wrap', 'genesis_footer_markup_close', 15 );
}
add_action( 'genesis_before', 'themeprefix_footer_site_inner' );


//Add in a wrap around the main content
function wpb_open_content_wrap() {
	echo '<div class="wrap">';
}
add_action( 'genesis_before_content', 'wpb_open_content_wrap', 5 );

function wpb_close_content_wrap() {
	echo '</div>';
}
add_action( 'genesis_after_content', 'wpb_close_content_wrap', 95 );