body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
}

header {
    background-color: #333;
    color: white;
    padding: 10px 20px;
}

nav {
    display: flex;
    align-items: center;
}

.hamburger {
    font-size: 30px;
    cursor: pointer;
    display: none;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
}

ul li {
    margin: 0 15px;
}

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

main {
    padding: 20px;
}

footer {
    text-align: center;
    padding: 10px;
    background-color: #333;
    color: white;
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    ul {
        display: none;
        flex-direction: column;
        background-color: #333;
    }

    ul.show {
        display: flex;
    }

    ul li {
        margin: 10px 0;
    }
}