For a website, what are good ways to indicate there is more content below the fold?

On a Mac, the scroll bars are pretty minimal or invisible. This question talks about that - Is the currently most used scrollbar pattern good for ux?

I usually try to put content that gets cut off on the bottom of the page to let people know there is content below the fold.

However with responsive designs, different browser sizes, that content won't always land on the fold.

So what are good ways to indicate there is more content below the fold?