web/src/.umi/plugin-icons/index.css

.umiIconDoNotUseThisHover {
  display: none;
}
.umiIconDoNotUseThis:hover svg {
  display: none;
}
.umiIconDoNotUseThis:hover .umiIconDoNotUseThisHover {
  display: inline-block;
}
.umiIconLoadingCircle {
  display: inline-block;
  -webkit-animation: loadingCircle 1s infinite linear;
  animation: umiIconLoadingCircle 1s linear infinite;
}

@-webkit-keyframes umiIconLoadingCircle {
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes umiIconLoadingCircle {
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}