@media (max-width: 768px) {
    .nav-links {
       flex-direction: column;
     }
   }
   table {
    border-collapse: collapse;
    width: 100%;
    margin-top: 20px;
}
th, td {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
}
th {
    background-color: #f2f2f2;
}
tr:nth-child(even) {
    background-color: #f9f9f9;
}