.loader{width:50px;padding:8px;aspect-ratio:1;border-radius:50%;background:red;--m1: conic-gradient(#0000 10%, #000), linear-gradient(#000 0 0) content-box;-webkit-mask:var(--m1);mask:var(--m1);-webkit-mask-composite:source-out;mask-composite:subtract;animation:loader-spin 1s infinite linear}@keyframes loader-spin{to{transform:rotate(1turn)}}