body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
    color: #333;
}

header {
    background: #333;
    color: #fff;
    padding: 20px;
}

header h1 {
    margin: 0 0 15px;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin-right: 20px;
}

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

main {
    max-width: 900px;
    margin: 30px auto;
    padding: 30px;
    background: #fff;
}

h1,
h2 {
    color: #333;
}

input,
textarea {
    width: 100%;
    max-width: 500px;
    padding: 10px;
    margin-top: 5px;
    box-sizing: border-box;
}

button {
    padding: 10px 20px;
    background: #333;
    color: #fff;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #555;
}

footer {
    text-align: center;
    padding: 20px;
    background: #333;
    color: #fff;
}