@charset "UTF-8";

     @media screen and (max-width: 1023px){ } @media screen and (max-width: 834px){ } @media screen and (max-width: 480px){ }
function add_image_preload() {
if (is_single() || is_page()) {
echo '<link rel="preload" as="image" href="' . get_the_post_thumbnail_url() . '" />';
}
}
add_action('wp_head', 'add_image_preload');