#loading {
  display: none;
  transform: translate(-50%, -50%);
  border: 6px solid gray;
  border-top: 6px solid var(--body-color);
  border-radius: 50%;  
  width: 15px;
  height: 15px;
  animation: spin 2s linear infinite;
}

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