h1 {
    text-align: center;
    font-size: 2.5em;
}

footer {
    text-align: center;
    padding: 10px 0;
}

nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    text-align: center;
}

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

nav {
    text-align: center;
}

.center-content {
    text-align: center;
}

.product-table {
    margin: auto;
    border: 1px solid #000;
}

body {
    background-color: #f7f7f7;
    /* light gray, or any color you like */
    color: #000;
    /* black text */
    font-family: Arial, sans-serif;
    margin: 10px;
}