htaccess – showing folders/files

My domain and host are separate. My domain provider doesn’t support domain masking, only http or frame forwarding. Currently I have frame forwarding, which is probably not a good idea for SEO or bookmarking etc.

I want my domain ie
https://www.aaa.com

to forward to my host ie
https://www.bbb.com/ccc/

but to show all the folders/files created in WordPress

For example on my host the folders files look like
https://www.bbb.com/ccc/about
https://www.bbb.com/ccc/blog/08/03/whatever

but want them to appear like the following
https://www.aaa.com/about
https://www.aaa.com/blog/08/03/whatever

I am told I can do this in htaccess but really have no idea how. Any advice would be gratefully received! Thanks so much.

Steve