/* Full page background */
body.login-page {
  background-color: #000;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* White login card */
.login-page .card {
  background: #fff;
  border-radius: 12px;
}

/* Spinner for button */
.btn-spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid #fff;
  border-top-color: transparent;
  border-radius: 50%;
  margin-right: 8px;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}