category as subdomain

I am new to wordpress

I need my categories as subdomains i,e. https://domain.com/category/post to https://category.domain.com/post

I have tried using wp-subdomains , subdomains, main category subdomains plugins but i have a problem ,
when accessing my site home page all icons (theme icons) are displaying perfectly,
but when i access https://category.domain.com/post the images that i have included in post are displaying perfectly, but theme icons(fb icon…..,etc)are not displaying…

any help is greatly appreciated

My site: https://onmirror.net

Problem:
https://sports.onmirror.net/fifa/

Thank you WordPress fellas.