Apologies if this has been asked before. I’m wondering if it’s possible to modify the image size in the wysiwyg boxes created by advanced custom fields. I tried adding an admin CSS file in functions but that won’t work as I can’t hook in to the iframe that the wysiwyg is being run through.
At the moment images show at 100% width, which is a problem when the client uploads super large images. Ideally I’d like to add a max-width to the image. Is that possible? Would welcome any thoughts on how to do it.