body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #2c3e50;
    color: #ecf0f1;
}

header {
    background-color: #2980b9;
    color: #fff;
    padding: 1em 0;
    text-align: center;
}

nav a {
    color: #fff;
    margin: 0 1em;
    text-decoration: none;
}

main {
    padding: 2em;
    background-color: #34495e;
    border-radius: 8px;
    margin: 1em;
}

.image-container img {
    display: block;
    margin: 1em auto;
    max-width: 100%;
    height: auto;
    border: 5px solid #1abc9c;
    border-radius: 8px;
}

footer {
    background-color: #2980b9;
    color: #fff;
    text-align: center;
    padding: 1em 0;
    position: relative;
    width: 100%;
}