gender-voice-visualization/ui/spinner.css

.spinner,
.spinner:after {
  border-radius: 50%;
  width: 3em;
  height: 3em;
  position: relative;
  flex-shrink: 0;
}
.spinner {
  margin: 60px auto;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border-top: .5em solid var(--accent);
  border-right: .5em solid var(--accent);
  border-bottom: .5em solid var(--accent);
  border-left: .5em solid var(--button-background);
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-animation: load8 1.1s infinite linear;
  animation: load8 1.1s infinite linear;
}
@-webkit-keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

header .spinner {
	margin-left: 1em;
}

header .spinner.hidden + .loading-message {
	display: none;
}
header .spinner + .loading-message {
	display: inline;
	flex-shrink: 0;
}