body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
}

nav {
    background-color: #ffffff;
    color: white;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

nav .logo img {
    height: 40px;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    margin: 0;
}

nav ul li {
    margin-left: 1rem;
}

nav ul li a {
    color: black;
    text-decoration: none;
    padding: 0.5rem 1rem;
    display: block;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

nav ul li a:hover,
nav ul li a.active {
    background-color: #007BFF;
}

.content {
    padding: 2rem;
    max-width: 800px;
    margin: 2rem auto;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 2rem;
    color: #34495e;
}

p {
    font-size: 1rem;
    color: #666;
    line-height: 1.5;
}

ul.content_list li {
    padding: 0.5rem 1rem;
    color: #666;
}