.loader-page-web {
  width: 25px;
  height: 25px;
  border-radius: 50%;
  background: 
    radial-gradient(farthest-side,#848484 94%,#0000) top/4px 4px no-repeat,
    conic-gradient(#0000 30%,#848484);
  -webkit-mask: radial-gradient(farthest-side,#0000 calc(100% - 4px),#000 0);
  animation:s3 0.5s infinite linear;
}

@keyframes s3{ 
  100%{transform: rotate(1turn)}
}