body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header, nav, main, footer {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
}

nav ul {
    display: flex;
    justify-content: space-between;
    list-style-type: none;
    padding: 0;
    background-color: #333;
    border-radius: 5px;
    margin: 20px 0;
}

nav ul li {
    flex: 1;
    text-align: center;
}

nav ul li a {
    text-decoration: none;
    color: #fff;
    padding: 10px 5px;
    display: block;
    border-right: 1px solid #555;
    transition: background-color 0.3s;
}

nav ul li a:hover {
    background-color: #555;
}

nav ul li:last-child a {
    border-right: none;
}

h1 {
    color: gold;
}

h2, h3 {
    margin-top: 0;
    border-bottom: 2px solid #333;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

footer {
    text-align: center;
    padding: 15px 0;
    font-size: 0.9em;
    color: #555;
}

@media screen and (max-width: 600px) {
    nav ul {
        flex-direction: column;
    }
    
    nav ul li a {
        border-bottom: 1px solid #555;
    }

    nav ul li:last-child a {
        border-bottom: none;
    }
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
}