body {
  font-family: Arial, sans-serif;
  background: #f4f4f9;
  padding: 20px;
  text-align: center;
  margin: 0;
}

h2 {
  margin: 20px 0;
  color: #007bff;
}

nav {
  background: #007bff;
  padding: 12px;
}
nav a {
  color: white;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}
nav a:hover {
  text-decoration: underline;
}

table {
  border-collapse: collapse;
  margin: auto;
  width: 95%;
  background: #fff;
  box-shadow: 0px 2px 8px rgba(0,0,0,0.1);
}

th, td {
  border: 1px solid #ccc;
  padding: 10px;
  text-align: center;
}

th {
  background: #007bff;
  color: #fff;
}

tr:nth-child(even) {
  background: #f9f9f9;
}

.article {
  background: #fff;
  padding: 15px;
  margin: 15px auto;
  max-width: 800px;
  border-left: 5px solid #007bff;
  text-align: left;
}