Dera Olly,

It shall belong to you!
Here is the content:

—————————–

<?php
/*
Plugin Name: WPPizza Custom Functions
Description: WPPizza custom functions that run regardless of theme used (use instead of putting them into a theme's functions.php)
Version: 0.1
Author: ollybach
Author URI: https://www.wp-pizza.com
*/
/*
add your filters/actions etc here
*/
$styles = apply_filters('wppizza_ingredients_filter_email_styles', $styles );
add_filter('wppizza_ingredients_filter_email_styles', 'myprefix_filter');
function myprefix_filter($styles){
$styles[ingrinfo] .= 'font-size:110%;';/* the 120% here overrides any previous font-size declaration for the element */
return $styles;
}

Line 16 is the:

$styles[ingrinfo] .= 'font-size:110%;';/* the 120% here overrides any previous font-size declaration for the element */

Thanks

Do you mean to replace line 16 with the bottom code?

$styles = apply_filters(‘wppizza_ingredients_filter_email_styles’, $styles );