Question regarding default fonts. Which can I use?

In block editor I’m using the cover block. I want to change the font of some text I use on the cover block. I’m assigning a class to that block, lithos-style.
I add a custom Html block and write:

<style>
.lithos-style {
    font-family: 'Lithos Pro';
}
</style>

On my PC it looks like this.
https://ibb.co/QKws3kQ

On another PC it looks different.
https://ibb.co/jRcZZRv

Obviously the Lithos Pro looks right on my PC because it has that font installed. On a PC without that font installed it won’t show.

My question is, how do I know which are the default fonts that all PCs and mobile devices have?