Hello Ed,

To do this you need to use a child theme then you need add this to your child theme functions.php :

wp_deregister_script( 'customjs' ); 

wp_enqueue_script( 'customjs', get_stylesheet_directory_uri() .'/js/customjs.js', array( 'jquery' ), false, true );

Then create a new folder named : js 

in the child theme and copy the customjs.js file of the main theme ( thefox/js/ folder ) and paste it in the new js folder you just created.

Then you can edit the customjs.js file of the child theme and change the line 62 and 70

change 100px to the height you want to use.

Do not hesitate to contact us if you have more questions.

Regards.