.playBtn{--border-angle:0turn;--main-bg:conic-gradient(from var(--border-angle),#213,#112 5%,#112 60%,#213 95%);border:5px solid transparent;border-radius:2em;--gradient-border:conic-gradient(from var(--border-angle),transparent 25%,#08f,#f03 99%,transparent);animation:bg-spin 3s linear infinite;@keyframes bg-spin{to{--border-angle:1turn}}&:hover{animation-play-state:paused}}@property --border-angle{syntax:"<angle>";inherits:true;initial-value:0turn}