* {
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
  }
  
  body {
    margin: 0;
    font-family: Arial, sans-serif;
  }
  
  /* Style the top navigation bar */
  .topnav {
    overflow: hidden;
    background-color: #333;
  }
  
  /* Style the topnav links */
  .topnav a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }
  
  /* Change color on hover */
  .topnav a:hover {
    background-color: #ddd;
    color: black;
  }
  
  /* Style the content */
  .content {
    background-color: #ddd;
    padding: 10px;
    height: 200px; /* Should be removed. Only for demonstration */
  }
  
  /* Style the footer */
  .footer {
    background-color: #f1f1f1;
    padding: 10px;
  }

  body {
    font-family: Arial, sans-serif;
  }

  table {
    width: 100%;
    border-collapse: collapse;
  }

  th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: center;
  }

  th {
    background-color: #f2f2f2;
  }

  #message-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 20px;
    border-radius: 5px;
    color: #fff;
    z-index: 1000;
    text-align: center;
    display: none;
}
#message-container.success {
    background-color: #4CAF50; /* Green */
}
#message-container.error {
    background-color: #f44336; /* Red */
}