spinner.css

.spinner {
  --frame: 1s;
}
.spinner,
.spinner::before,
.spinner::after {
  border: 5px solid white;
  border-top-color: transparent;
  border-bottom-color: transparent;
  border-radius: 50%;
}
.spinner {
  margin: auto;
  font-size: 4em;
  position: absolute;
  top: 4px;
  left: 140px;

  width: 0.5em;
  height: 0.5em;
  -webkit-animation: anim-spinner var(--frame) ease infinite;
  animation: anim-spinner var(--frame) ease infinite;
}
.spinner::before,
.spinner::after {
  content: '';
  position: absolute;
}
.spinner::before {
  inset: 1px;
  -webkit-animation: anim-spinner calc(var(--frame) * 4.3) ease-in infinite;
  animation: anim-spinner calc(var(--frame) * 4.3) ease-in infinite;
}
.spinner::after {
  inset: 7px;
  -webkit-animation: anim-spinner calc(var(--frame) * 1.51) ease-out infinite;
  animation: anim-spinner calc(var(--frame) * 1.51) ease-out infinite;
}

@-webkit-keyframes anim-spinner {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(359deg);
  }
}
@keyframes anim-spinner {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(359deg);
  }
}