.loader:only-child {
  width: 80px;
  height: 80px;
  position: fixed;
  top: 50%;
  left: 50%;
  margin-top: -40px;
  margin-left: -40px;
  box-sizing: border-box;
}

.loader:only-child::after {
  box-sizing: border-box;
  content: " ";
  display: block;
  width: 64px;
  height: 64px;
  margin: 8px;
  border-radius: 50%;
  border: 6px solid var(--loader-color, #000);
  border-color: var(--loader-color, #000) transparent var(--loader-color, #000) transparent;
  animation: loader 1.2s linear infinite;
}

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