.loader {
  height: 30px;
  width: 30px;
  position: absolute;
  left: 50%;
  margin-left: -20px;
  top: 50%;
  margin-top: -20px;
  
  &:before,
  &:after {
    content: "";
    height: 30px;
    width: 30px;
    border: 8px solid rgba(255,255,255,.5);
    position: absolute;
    top: 0;
  }
  
  &:before {
    animation: animate 2s infinite linear;
  }
  
  &:after {
    animation: animate2 2s infinite linear;
  }
}

@keyframes animate {
  100% {
    transform: rotate(180deg);
  }
}

@keyframes animate2 {
  100% {
    transform: rotate(360deg);
  }
}