body {
    font-family: Arial, sans-serif;
    margin: 20px;
    padding: 20px;
    background-color: #f4f4f4;
    text-align: center;
}
form {
    background: white;
    padding: 20px;
    border-radius: 5px;
    width: 300px;
    margin: auto;
}
input, button {
    width: 100%;
    margin: 10px 0;
    padding: 10px;
}
button {
    background: green;
    color: white;
    border: none;
    cursor: pointer;
}
button:hover {
    background: darkgreen;
}