blanco/functions.php

<?php

add_theme_support('align-wide');
add_theme_support('title-tag');
add_theme_support('post-thumbnails');

add_image_size('xs', 300, 300);
add_image_size('sm', 500, 500);
add_image_size('md', 800, 800);
add_image_size('lg', 1200, 1200);
add_image_size('xl', 1500, 1500);
add_image_size('xxl', 2000, 2000);
add_image_size('xxxl', 3000, 3000);