body {
    background-color: #f0f8ff;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333333;
    line-height: 1.6;
}

h1, h2, h3 {
    color: #006400;
}

h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

h2 {
    font-size: 2em;
    margin-bottom: 15px;
}

h3 {
    font-size: 1.75em;
    margin-bottom: 10px;
}

a {
    color: #1e90ff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

nav {
    background-color: #e0ffff;
    border-bottom: 2px solid #bbb;
    padding: 10px;
}

nav a {
    margin-right: 15px;
}