calc-size()The calc-size() CSS function computes mathematical expressions that include height and width keyword values, for example calc-size(fit-content, size / 2). Not to be confused with the calc() CSS function, which cannot use keyword values.cssCSSlimitedhttps://drafts.csswg.org/css-values-5/#calc-sizehttps://developer.mozilla.org/docs/Web/CSS/Reference/Values/calc-sizecss.types.calc-sizehttps://nowyoucanuse.com/features--calc-size.html