CSS: svh unit

Represents a percentage of the height of the viewport's initial containing block. 1vh is 1% of the viewport height. For example, if the viewport height is 300px, then a value of 70vh on a property will be 210px. For small, large, and dynamic viewport sizes, the respective viewport-percentage units are svh, lvh, and dvh. vh represents the viewport-percentage length unit based on the browser default viewport size.