Colorful Category in the post_meta in Archives/Posts

Hello guys,

Does anybody know how to get colorful categories in the post pages, and also in the blog archive page?
I’d like to achieve something like that on the Theme GridLove:
https://themeforest.net/item/gridlove-creative-grid-style-news-magazine-wordpress-theme/17990371
https://demo.mekshq.com/?theme=gridlove
(I don’t know if it’s allowed to post that kind of link here)
Thanks so much