body {
    font-family: Arial, sans-serif;
    padding: 0;
    margin: 0;
    background: #f4f4f4;
    color: #333;
}
header {
    background: #007BFF;
    color: white;
    padding: 20px;
    text-align: center;
}
header nav a {
    margin: 0 15px;
    color: white;
    text-decoration: none;
}
header nav a:hover {
    text-decoration: underline;
}
main {
    padding: 20px;
}
footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 10px;
}
.logo {
    width: 100px;
}
.error-image {
    width: 300px;
    margin-top: 20px;
}