RapidWeaver Stacks add-on info:
Create floating stacks: Floating button bars, floating header bars, floating buttons, floating almost anything. The FixMe stack allows you to fix stack with great precision. Add borders and soft shadows. Responsiveness: Hide or release the float on small screens below a breakpoint of your own choice.


Special features:
The FixMe stack also has a couple of options making it easier to work with fixed stacks – for instance you can hide the floating stack in edit with one click. Very handy when you need to work with the content beneath!

Keywords:
RapidWeaver, stacks, responsive, float, sticky, fixed position.