body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    background-image: url("../image/background-image.png");
}

header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
}

header nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    margin: 0;
    padding: 0;
}

header nav ul li {
    margin: 0 15px;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    position: absolute;
    bottom: 0;
    width: 100%;
}

footer nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    margin: 0;
    padding: 0;
}

footer nav ul li {
    margin: 0 15px;
}

footer nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

.registration, .login, .send-message, .friend-request, .messages, .friends, .admin, .profile, .upload, .impressum {
    max-width: 500px;
    margin: 0 auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.admin, .upload, .profile, .impressum {
    max-width: 800px;
}

.registration form, .login form, .send-message form, .friend-request form, .admin form, .upload form {
    display: flex;
    flex-direction: column;
}

.registration form label, .login form label, .send-message form label, .friend-request form label, .admin form label, .upload form label {
    margin-bottom: 5px;
}

.registration form input, .login form input, .send-message form input, .send-message form textarea, .friend-request form input, .admin form input, .admin form select, .upload form input {
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.registration form button, .login form button, .send-message form button, .friend-request form button, .admin form button, .upload form button {
    padding: 10px;
    background-color: #333;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.registration form button:hover, .login form button:hover, .send-message form button:hover, .friend-request form button:hover, .admin form button:hover, .upload form button:hover {
    background-color: #555;
}

.profile .profile-pictures img {
    margin: 10px;
    border-radius: 8px;
    border: 2px solid #ccc;
    width: 100px;
    height: 100px;
    object-fit: cover;
}

.impressum {
    background-color: #f9f9f9;
    border: 1px solid #ddd;
}

.impressum h2 {
    font-size: 2em;
    margin-bottom: 20px;
    color: #333;
}

.impressum p {
    font-size: 1em;
    line-height: 1.5;
    color: #555;
}

.impressum a {
    color: #007BFF;
    text-decoration: none;
}

.impressum a:hover {
    text-decoration: underline;
}

.underage {
    color: red;
    font-weight: bold;
}