.loader {
  --size: 48px;
  --border-size: 5px;

  width: var(--size);
  height: var(--size);
  border: var(--border-size) solid #FFF;
  border-bottom-color: transparent;
  border-radius: 50%;
  display: inline-block;
  box-sizing: border-box;
  animation: loader-rotation 1s linear infinite;
}

@keyframes loader-rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}