CSS in editor not loading as CDN is getting blocked

[adisa_craig]

Is there a way for me to allow certain CDNs to be unblocked in the editor. I would like to use bootstrap from CDN within my theme design however it seems that it is getting blocked when viewing in the editor. 

[Bernadette3]

Thanks for reaching out @adisa_craig I'll see if someone on here has any information.

@Adam @MTpockets