VC3104: CSS value isn't valid for the property

The value isn't one the property accepts, so the browser ignores the whole declaration. Common properties are checked: keywords (display, position, overflow...) and lengths (width, margin, padding, gap...), including how many values each takes.

How to fix

Check the spelling (the quick fix offers the closest keyword), add a unit (10px, not 10), or remove extra values. Values using var() aren't checked.

Example

margin: 1px 2px 3px 4px 5px - margin takes at most 4 values.