css* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

header {
    background: #4CAF50;
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
}

nav li {
    margin: 0 20px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

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

main {
    margin-top: 80px;
    padding: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

section {
    margin-bottom: 40px;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h1, h2 {
    color: #4CAF50;
    margin-bottom: 20px;
}

button {
    background: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #45a049;
}

form {
    display: flex;
    flex-direction: column;
}

input, textarea {
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

textarea {
    height: 100px;
    resize: vertical;
}

#message-area {
    margin-top: 20px;
    padding: 10px;
    background: #f0f0f0;
    border-radius: 4px;
    display: none;
}

footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}