#loader-cont {
    display: none;
    position: fixed; /* Stay in place */
    z-index: 9; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
  }
  
  #loader {
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 10;
    margin: -15px 0 0 -15px;
    border: 8px solid #f3f3f3;
    border-radius: 50%;
    border-top: 8px solid #3498db;
    width: 30px;
    height: 30px;
    animation: spin 2s linear infinite;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }