body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f4f4f4;
}

header {
  background: #222;
  color: white;
  padding: 15px;
}

nav a {
  margin-right: 15px;
  color: #ddd;
  text-decoration: none;
}

nav a.active {
  color: #fff;
  font-weight: bold;
}

main {
  width: 90%;
  max-width: 900px;
  margin: 40px auto;
}

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

table th,
table td {
  padding: 14px;
  border: 1px solid #ccc;
  text-align: left;
}

table th {
  background: #333;
  color: white;
}

table td a {
  color: #0077cc;
  text-decoration: none;
}

table td a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  table {
    font-size: 14px;
  }
}