body {
    font-family: Arial, sans-serif;
    background-color: #e0f7fa;
    color: #004d40;
    margin: 0;
    padding: 0;
    font-size: 18px;
    font-weight: 400;
}

header {
    background-color: #0288d1;
    padding: 20px;
    text-align: center;
}

header h1 {
    color: #ffffff;
    margin: 0;
    font-size: 36px;
    font-weight: 700;
}

nav {
    background-color: #4fc3f7;
    padding: 10px 0;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    text-align: center;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    font-size: 20px;
}

nav ul li a:hover {
    text-decoration: underline;
}

main {
    padding: 20px;
    text-align: center;
}

main h2 {
    color: #00796b;
    font-size: 28px;
    font-weight: 700;
}

main img {
    margin: 10px 0;
}

main div {
    background-color: #b2ebf2;
    padding: 15px;
    border-radius: 5px;
    color: #004d40;
    font-size: 20px;
    font-weight: 700;
}

main img {
    border: 2px solid #0288d1;
    border-radius: 10px;
}