Help Setting Up a Flip Clock Feature in Ghost

I’m trying to add a flip clock like this one: Flip Clock example to my Ghost site. I want it to be responsive, minimalist, and easy to customize (e.g., colors or fonts).

I’m considering:

Using a library like FlipClock.js.
Adding custom HTML, CSS, and JS via Code Injection or theme customization.

Has anyone done something similar or know the best way to integrate this?

You are right, using code injection or theme customization are the way to do this.

It is like others project that want to add customize frontend code.