body, html {
    height: 100%;
    margin: 0;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f0f0f0;
}

.container {
    text-align: center;
}

h1 {
    font-size: 3em;
    margin-bottom: 0.2em;
}

h2 {
    font-size: 1.5em;
    margin-bottom: 1em;
}

form {
    margin-top: 2em;
}

input[type="email"] {
    padding: 10px;
    font-size: 1em;
    width: 250px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

button {
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 5px;
    border: none;
    background-color: #28a745;
    color: white;
    cursor: pointer;
}

button:hover {
    background-color: #218838;
}

#response-message {
    margin-top: 1em;
    color: green;
}