body, html {
    height: 100%;
    margin: 0;
    font-family: Arial, sans-serif;
  }
  .preloader {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f8f9fa;
    text-align: center;
  }
  .preloader img {
    width: 120px;
    margin-bottom: 20px;
  }
  .progress {
    width: 200px;
    height: 20px;
  }
  .login-page {
    display: none;
    height: 100vh;
    justify-content: center;
    align-items: center;
  }