Position fixed / sticky for next button

Hello!
One page of my survey contains content that does not necessarily have to be viewed completely by participants. Therefore I would like to fix / sticky the position of the next button using CSS. Essentially, instead of being displayed at the very bottom of the page, I would like the next button to always stick to the bottom right corner of the browser window. However, using the regular position:fixed or position:sticky attributes does not do the trick. I tried this with both the #Button and #NextButton elements.
Can anyone help me out here? Fixing the next button to the top of the page would be an acceptable alternative.
Best,
Tim