Add this cssAdd this css
/* =Fixed Width——————————————————– */#container,#footer { width: 960px!important;}Add this php to the functions.php in the child theme
// Disable media queries<?phpfunction remove_media_queries() {wp_dequeue_style( ‘responsive-media-queries’ );}add_action( ‘wp_enqueue_scripts’, ‘remove_media_queries’, 20 );?>You may also need to remove or comment out the viewport meta data in your child theme’s header.php file.
Further info here