Duplicate header cart icon in fixed position on desktop (open mini-cart)

Hi,

I would like to add a custom cart icon fixed at the bottom right of the screen (only on desktop), outside the header.

I want it to behave exactly like the default cart icon in the header — meaning, when the user clicks it, it should open the same off-canvas mini-cart.

In short: I’d like to display the same cart element used in the header, but in a fixed position on desktop.

What is the correct way to trigger the mini-cart from a custom button or element placed elsewhere on the page?

Is there a specific HTML structure or JavaScript function required to make it work?

Thank you in advance!