body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 20px; /* Adds a margin of 20px around the page */
    padding: 0;
}

header {
    background: #d03a4a;
    color: #fff;
    padding: 1em 0;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    background: #444;
    margin: 0;
}

nav ul li {
    margin: 0 15px;
}

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

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

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

table th {
    background: #f4f4f4;
}