You can do this, but you will need to create a child theme first.
In your child theme’s style sheet, add:
#header {height:120px;}
and in your child theme’s functions file, add:
/* Modify the height of the header image */
function graphene_modify_header_height(){
return 120;
}
add_filter('graphene_header_image_height', 'graphene_modify_header_height');
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