@property --a{syntax:"<angle>";inherits:false;initial-value:0deg}div.gradient{height:100%;width:100%;--a:0deg;animation:gradient 10s linear infinite;background-image:conic-gradient(from 0deg at 50% 50%,red 4%,#faff0a 19%,#00ff0a 30%,#06f 45%,#3200ff 54%,#db00ff 66%,#ad00ff 80%,red 95%);background-image:conic-gradient(from var(--a) at 50% 50%,red 4%,#faff0a 19%,#00ff0a 30%,#06f 45%,#3200ff 54%,#db00ff 66%,#ad00ff 80%,red 95%)}@keyframes gradient{0%{--a:0deg}50%{--a:180deg}to{--a:360deg}}