body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px 0;
    text-align: center;
    position: sticky;
    top: 0;
}

h1 {
    margin: 0;
    font-size: 2em;
}

nav {
    margin: 20px 0;
}

nav select {
    padding: 10px;
    font-size: 16px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

main {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

section {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    position: sticky;
    bottom: 0;
}

footer p {
    margin: 0;
}