body {
    background-color: #e0f7fa;
    font-family: 'Arial', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    color: #333;
}

header {
    text-align: center;
    background-color: #00796b;
    color: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

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

h2 {
    color: #004d40;
    margin-top: 20px;
    font-size: 1.8em;
}

nav {
    background-color: #ffffff;
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-top: 20px;
}

a {
    color: #00796b;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.3s, color 0.3s;
}

a:hover {
    background-color: #004d40;
    color: white;
}