This looks interesting. I have used this in the past, although it relies on non-standard CSS to get the results. https://github.com/rodneyrehm/viewport-units-b

This looks interesting. I have used this in the past, although it relies on non-standard CSS to get the results. https://github.com/rodneyrehm/viewport-units-buggyfill https://github.com/rodneyrehm/viewport-units-buggyfill