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

header {
    background-color: #4CAF50; /* Calm green for a professional feel */
    color: white;
    text-align: center;
    padding: 20px;
}

nav a {
    margin: 0 15px;
    color: white;
    text-decoration: none;
}

section {
    padding: 20px;
    margin: 20px auto;
    max-width: 800px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

footer {
    text-align: center;
    padding: 10px;
    background-color: #ddd;
}

button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}