.ajax-big-loader {
    border: 6px solid #f3f3f3; /* Light grey */
    border-top: 6px solid #0097cd; /* Blue */
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 2s linear infinite;
    z-index: 100000001;
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -20px;
    margin-left: -20px;
    background: #fff;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }