body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #004080;
    color: #fff;
    text-align: center;
    padding: 1em 0;
    position: relative;
    width: 100%;
}

header h1 {
    margin: 0;
    font-size: 2em;
}

header p {
    position: absolute;
    right: 10px;
    top: 10px;
    margin: 0;
    font-size: 1em;
}

nav {
    background-color: #006400;
    width: 200px;
    padding: 1em;
    position: fixed;
    height: 100%;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

nav a {
    display: block;
    color: #fff;
    text-decoration: none;
    padding: 0.5em;
    margin-bottom: 0.5em;
    background-color: #008000;
    border-radius: 5px;
    text-align: center;
}

nav a:hover {
    background-color: #00cc00;
}

main {
    margin-left: 220px;
    padding: 1em;
    flex-grow: 1;
}

img {
    width: 300px;
    height: 300px;
    display: block;
    margin: 0 auto;
}

footer {
    background-color: #004080;
    color: #fff;
    text-align: center;
    padding: 1em 0;
    width: 100%;
    position: relative;
}

.content {
    margin: 20px 0;
}

@media (max-width: 768px) {
    nav {
        width: 100%;
        position: relative;
        height: auto;
    }
    
    main {
        margin-left: 0;
        width: 100%;
    }
}