body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}
header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1em;
}
nav a {
    color: white;
    margin: 0 1em;
    text-decoration: none;
}
main {
    max-width: 800px;
    margin: 0 auto;
    padding: 2em;
}
form {
    display: flex;
    flex-direction: column;
    gap: 1em;
    max-width: 400px;
    margin: 0 auto;
}
input, button {
    padding: 0.5em;
    font-size: 1em;
}
button {
    background-color: #333;
    color: white;
    border: none;
    cursor: pointer;
}
button:hover {
    background-color: #555;
}