Brunelleschi child theme – changing custom header image

Hi all,

I’ve searched for the answer to this, found several different ones, but can’t get it to work.

I have a child theme of Brunelleschi installed, the to banner is 960 x 198 – but that’s too high for my artwork, i need it 110 high, same width

I created a functions.php in my child theme then wrote this in it:

<?php

function HEADER_IMAGE_HEIGHT($size) { return 198; }
apply_filters(‘brunelleschi_header_image_height’, ‘110’);

?>

but it’s not working. do i also need to write something in the .css?

thanks for your advice

ellie