.box {
  width: 100vw;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  display: grid;
  place-content: center;
  background: #1f385a;
  z-index: 999;
}
.single {
  transform: scale(0.6) rotate(0);

  animation: spin 2s ease-in-out infinite;
}

@keyframes spin {
  to {
    transform: scale(0.6) rotate(1turn);
  }
}