.loader {
    border: 4px solid #eee;
    border-top: 4px solid #0070c9;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 20px auto;
  }
  
  @keyframes spin {
    100% { transform: rotate(360deg); }
  }
  
  .tracking-history {
    list-style: none;
    padding: 0;
  }
  
  .tracking-history li {
    padding: 12px;
    border-left: 3px solid #0070c9;
    margin-bottom: 10px;
    background: #f9f9f9;
  }