.loader {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid #fff;
    border-top: 2px solid black;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
  }
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }