Apply code or styles to a single page in WordPress

wp-change-one-page.php

/**
 * Change styles applied to one page
 *
 * Uses 'wp' to run after WP class object so page content is available 
 */
function sv_hide_header_footer_for_page() {
  if( is_page( 2576 ) ) {
		?> <style>
			
			header#header,
			div.footer-widgets { display:none; }
				
			</style>
		<?php
	}
}
add_action( 'wp', 'sv_hide_header_footer_for_page' );