#wip {
  display: inline-block;
}

#loading {
  display: inline-block;
  
  width: 1em;
  height: 1em;
  mask-image: radial-gradient(transparent 40%, black 40% 60%, transparent 60%);
  background-image: linear-gradient(var(--text-color) 40%, transparent 40% 60%, var(--text-color) 60%);
  
  animation: rot 1s infinite;
}

@keyframes rot {
  0% {transform: rotate(0deg) }
  75%, 100% {transform: rotate(180deg) }
}