.box{place-content:center;color:#fff;text-shadow:0 1px 0 #000;--border-angle:0turn;--main-bg:conic-gradient(from var(--border-angle),#0e0f0c,#0e0f0c 5%,#0e0f0c 60%,#0e0f0c 95%);border:2px solid transparent;--gradient-border:conic-gradient(from var(--border-angle),transparent 25%,#baff38,#ffff38,transparent);background:var(--main-bg) padding-box,var(--gradient-border) border-box,var(--main-bg) border-box;background-position:50%;animation:bg-spin 3s linear infinite}@keyframes bg-spin{to{--border-angle:1turn}}@property --border-angle{syntax:"<angle>";inherits:true;initial-value:0turn}