#loading-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(128, 128, 128, 0.5);
      /* abu transparan */
      z-index: 9999;
      /* pastikan di atas elemen lain */
      display: flex;
      justify-content: center;
      align-items: center;
  }

  /* Spinner sederhana */
  .spinner {
      border: 7px solid #f3f3f3;
      border-top: 7px solid #3498db;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      animation: spin 1s linear infinite;
      box-sizing: border-box;
      transform-origin: center;
  }

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

      100% {
          transform: rotate(360deg);
      }
  }