#loader {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
    display: none; 
  }
  
  #loader img {
    height: 200px;
    width: 200px; 
    animation: spin 2s linear infinite; 
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  .loader {
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #3498db;
    width: 75px;
    height: 75px;
    animation: spin 2s linear infinite;
    margin: auto;
  }