body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
}

header {
    background-color: #003366;
    color: white;
    padding: 20px 0;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

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

header nav ul li {
    display: inline;
    margin-right: 20px;
}

header nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1em;
    padding: 10px;
    border-radius: 5px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

header nav ul li a:hover {
    background-color: #0055a5;
    transform: scale(1.1);
}

section {
    padding: 30px;
    margin: 20px auto;
    max-width: 800px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

section h2 {
    font-size: 2em;
    margin-bottom: 10px;
}

section p {
    line-height: 1.8;
    margin-bottom: 20px;
}

section ul {
    line-height: 1.8;
    margin-left: 20px;
}

section ul li {
    margin-bottom: 10px;
}

.back-link {
    display: inline-block;
    text-align: center;
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #003366;
    color: white;
    text-decoration: none;
    font-weight: bold;
    border-radius: 5px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.back-link:hover {
    background-color: #0055a5;
    transform: scale(1.05);
}

.back-link:active {
    background-color: #002d53;
}

#back-to-top {
    position: fixed; 
    left: 20px;  
    bottom: 20px; 
    padding: 15px;
    background-color: #003366;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#back-to-top:hover {
    background-color: #0055a5;
    transform: scale(1.1);
}

#back-to-top:active {
    background-color: #002d53;
}