/* Flip square */
.flip-square-loader {
  -webkit-perspective: 120px;
  -moz-perspective: 120px;
  -ms-perspective: 120px;
  perspective: 120px;
  width: 100px;
  height: 100px;
  border-radius: 100%;
  position: relative;
  margin: 0 auto;
}

.flip-square-loader:before {
  content: "";
  position: absolute;
  left: 25px;
  top: 25px;
  width: 50px;
  height: 50px;
  background-color: rgba(theme-color(success), .7);
  animation: flip 1s infinite;
}
@keyframes flip {
  0% {
    transform: rotate(0);
  }

  50% {
    transform: rotateY(180deg);
  }

  100% {
    transform: rotateY(180deg) rotateX(180deg);
  }
}