form {
    width: 50%;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ccc;
    background: #f9f9f9;
}

h2, h3 {
    text-align: center;
}

button {
    display: block;
    width: 100%;
    padding: 10px;
    background: green;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: darkgreen;
}