.loader {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: inline-block;
  position: relative;
  border: 10px solid;
  box-sizing: border-box;
  animation: animloader 1s linear infinite alternate;
}

@keyframes animloader {
  0% {
    border-color: white rgba(255, 255, 255, 0) rgba(255, 255, 255, 0) rgba(255, 255, 255, 0);
  }

  33% {
    border-color: white white rgba(255, 255, 255, 0) rgba(255, 255, 255, 0);
  }

  66% {
    border-color: white white white rgba(255, 255, 255, 0);
  }

  100% {
    border-color: white white white white;
  }
}