body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
    text-align: center;
}
nav {
    background: white;
    padding: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
nav a {
    text-decoration: none;
    color: #007BFF;
    font-size: 18px;
    font-weight: bold;
}
.logo {
    height: 50px;
}
main {
    max-width: 800px;
    margin: 50px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
h1, h2 {
    color: #333;
}