/* Full page flex container to center content */
#spinner-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(0,0,0,0.3); /* optional overlay */
}

/* The spinner itself */
.spinner {
  width: 70px;
  height: 70px;
  border: 8px solid #eee;
  border-top-color: #3498db;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Keyframes for rotation */
@keyframes spin {
  to { transform: rotate(360deg); }
}