.loader {
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 1;
    width: 150px;
    height: 150px;
    margin: -75px 0 0 -75px;
    border: 16px solid #D4D4D4;
    border-radius: 50%;
    border-top: 16px solid #05006D;
    width: 120px;
    height: 120px;
    background-color: transparent;
    animation: spin 2s linear infinite;
    display: none;
  }

  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

div.card-block span {
  display: block;
}

div.card {
  background-color: darkseagreen;
}