How to add your badge in Wordpress?

Question

CMS

Gentlemen, how to add your badge in Wordpress?
The template has a beautiful output style "On sale" and "Out of Stock".
I would like to add my own. How can this be implemented? (preferably without plugins: free ones are miserable, but you want to save money)
That is, the task is to add badges in the standard template style

Answer 1

There are no problems in this. You just need to have knowledge of css and html