body {
    font-family: Arial, sans-serif;
    direction: rtl;
    text-align: center;
    background-color: #f4f4f4;
}

header {
    background: #333;
    color: white;
    padding: 10px 0;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

table {
    width: 80%;
    margin: 20px auto;
    border-collapse: collapse;
}

table, th, td {
    border: 1px solid #ddd;
    padding: 10px;
}

th {
    background: #555;
    color: white;
}