Hallo Gunnar, ich versuche das besser gar nicht erst und überlasse das den [Experten bei MDN](https://developer.mozilla.org/en-US/docs/Web/CSS/calc): > **Note:** The + and - operators must be surrounded by whitespace. For instance, `calc(50% -8px)` will be parsed as a percentage followed by a negative length − an invalid expression − while calc(50% - 8px) is a percentage followed by a subtraction operator and a length. Likewise, calc(8px + -50%) is treated as a length followed by an addition operator and a negative percentage. > The * and / operators do not require whitespace, but adding it for consistency is both allowed and recommended. _Rolf_ -- sumpsi - posui - clusi

Hallo Gunnar, ich versuche das besser gar nicht erst und überlasse das den Experten: > **Note:** The + and - operators must be surrounded by whitespace. For instance, `calc(50% -8px)` will be parsed as a percentage followed by a negative length − an invalid expression − while calc(50% - 8px) is a percentage followed by a subtraction operator and a length. Likewise, calc(8px + -50%) is treated as a length followed by an addition operator and a negative percentage. > The * and / operators do not require whitespace, but adding it for consistency is both allowed and recommended. _Rolf_ -- sumpsi - posui - clusi