body {
    background-color: #f4f4f4;
    color: #333333;
    font-family: Arial, sans-serif;
    margin: 10px;
    padding: 0;
    width: auto;
}

h1 {
    text-align: center;
}

nav {
    text-align: center;
    padding: 10px 0;
    border-top: 1px solid #000;
    border-bottom: 1px solid #000;
    margin-bottom: 20px;
}

footer {
    clear: both;
    width: 100%;
    text-align: center;
    margin-top: 30px;
    padding: 20px 0;
    border-top: 1px solid #ccc;
}

footer p {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    display: block;
}

main {
    text-align: center;
}

p {
    text-align: left;
    max-width: 960px;
    margin: 20px auto;
    line-height: 1.6;
}

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

table, th, td {
    border: 2px solid black;
}

th, td {
    padding: 10px;
    text-align: center;
}

th {
    background-color: #e2e2e2;
}

img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
}