@property --myColor1{syntax: "<color>"; initial-value: #390000; inherits: false;}@property --myColor2{syntax: "<color>"; initial-value: black; inherits: false;}.background{background:linear-gradient(var(--myColor1),var(--myColor2))}#root{height:100vh;width:100vw;background:#121212}html{background:#121212}