add ribbon to my site navigation

Hey guys,

I want to make a ribbon for my site’s navigation menu bar similar to what you see on the sites below. However, I am not sure how to this. Can I just make and image in photoshop and put it into my css?

https://www.wpbeginner.com/
https://www.goodmorninglondon.fr/

My own site is https://www.jimmyesl.com

thank you