.loader {
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 250px;
    height: 250px;
    animation: spin 2s linear infinite;
    margin-left:auto;
    margin-right: auto;
    margin-top: 20vh;
  }


  .loader-wrapper {
    z-index:999999999999999999;
    width: 100%;
    height: 100%;
    position: fixed;
    background-color: black;
    opacity: 0.3;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }