@property --angle{syntax:"<angle>";initial-value:90deg;inherits:false}.header-border{backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);background:#fffffff2;border:transparent;transition-duration:.3s}.header-border:before{animation:rotate 10s linear infinite;background:conic-gradient(from var(--angle),#00000023,#ff000023,#ff000044,#00000023);content:"";inset:-1px;-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;padding:1px;position:absolute}.dark-theme .header-border{background:#000c}.dark-theme .header-border:before{background:conic-gradient(from var(--angle),#ffffff23,#ff000023,#ffffff33,#ffffff23)}@keyframes rotate{50%{--angle:90deg}to{--angle:450deg}}