body {
    margin: 0;
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: #f0f0f0;
  }
  
  h1 {
    margin: 20px 0;
  }
  
  .modal {
    display: none; /* Hidden by default */
    position: fixed;
    z-index: 1;
    left: 0; 
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
  }
  
  .modal-content {
    background-color: #fff;
    margin: 15% auto;
    padding: 20px;
    border-radius: 8px;
    width: 80%;
    max-width: 400px;
  }
  
  .close {
    float: right;
    font-size: 20px;
    cursor: pointer;
  }