Stack linking to non-secure resource

Hello. Wonder if anyone can help me work out which stack is linking to an insecure resource.

I’ve managed to find the link in the stacks_page_page3.js file (in www/files/) which I can download, manually change the link to https & then re-upload to the server. I have to keep doing this every time I update the website so wondered if there is a way to find the stack & edit it directly to fix the link.

The CSS it links to is:
http://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css

Does anyone know how to find which stack is doing this and, if so, whether I can edit the link within the stack directly? The manual correction each time I update is getting tedious.

Thanks
Alex

I think it’s more likely to be the theme that’s doing this. Have you got a link to the site?

Hi Rob.
The site is https://wellingtonicu.com
The theme is the recently retired Elixir Graphics Foundry (for which I realise these events will become increasingly more frequent).
Thanks for any advice you could provide.