body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.container {
    max-width: 800px;
    margin: 20px auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    margin-bottom: 20px;
}

h1 {
    margin: 0;
    font-size: 2.5em;
}

h2 {
    color: #666;
    margin: 10px 0;
}

nav {
    margin-bottom: 20px;
}

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

nav li {
    margin: 0 15px;
}

nav a {
    text-decoration: none;
    color: #007BFF;
    font-weight: bold;
    transition: color 0.3s;
}

nav a:hover {
    color: #0056b3;
}

section {
    margin-top: 20px;
}

h3 {
    border-bottom: 2px solid #007BFF;
    padding-bottom: 5px;
    color: #007BFF;
}

ul {
    list-style-type: none;
    padding: 0;
}

ul li {
    margin: 10px 0;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 4px;
    transition: background-color 0.3s;
}

ul li:hover {
    background-color: #e9ecef;
}