changedetection.io/changedetectionio/static/styles/scss/parts/_spinners.scss

/* spinner */
.spinner,
.spinner:after {
  border-radius: 50%;
  width: 10px;
  height: 10px;
}
.spinner {
  margin: 0px auto;
  font-size: 3px;
  vertical-align: middle;
  display: inline-block;
  text-indent: -9999em;
  border-top: 1.1em solid rgba(38,104,237, 0.2);
  border-right: 1.1em solid rgba(38,104,237, 0.2);
  border-bottom: 1.1em solid rgba(38,104,237, 0.2);
  border-left: 1.1em solid #2668ed;
  -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);
  }
}