Flex a circular hero button - css

I'm working on a mobile website. This particular page includes a giant red circular hero button. I'm struggling to find a way to make it properly responsive. If you make it one size, it fits iPhone 5 nicely, but the same size pushes the rest of the page off the screen for iPhone 4. The iPhone 4 size just makes it look terrible and be too small on iPhone 5.
So the behaviour that I'm looking for is this:
The hero button should get bigger in radius as the screen gets bigger
The hero button should not push any other elements off the screen or render wider than it's container.
The other parts of the page are a fixed size and layout and should stay that way.
I've used Flexbox for similar constraints in the past, but it doesn't seem to be fitting the bill here. When I make the container of the hero button a flexbox, it does not increase in height, and I have no idea how to make the width correspond.
How can I make the button expand to fill the available screen space?

You can use jquery to do this.
get the screen size by using $(window).height() and $(window).height() and set the size of your button accordingly

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