body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(to bottom, #27ae60, #2ecc71);
    color: #fff;
    font-size: 16px;
}

header {
    text-align: center;
    padding: 10px;
    background-color: #34495e;
}

header h1 {
    margin: 0;
    font-size: 24px;
}

header p {
    margin: 5px 0 0;
    font-size: 18px;
}

nav {
    background: #2c3e50;
    text-align: center;
}

nav a {
    display: block;
    color: #fff;
    text-decoration: none;
    padding: 10px 0;
    border-bottom: 1px solid #34495e;
    transition: background-color 0.3s ease;
}

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

nav a:hover {
    background-color: #34495e;
}

.banner {
    width: 100%;
    height: 200px;
    background: url('banner.jpg') no-repeat center center;
    background-size: cover;
}

section {
    padding: 15px;
    text-align: justify;
    line-height: 1.6;
}

footer {
    background-color: #34495e;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    position: relative;
    bottom: 0;
}

@media (max-width: 768px) {
    nav {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    nav a {
        width: 100%;
        border-bottom: none;
    }
}