#hd-subscribe-form {
    max-width: 360px;
    padding: 15px;
    background: #f9f9f9;
    border: 1px solid #eee;
    border-radius: 6px;
}

#hd-subscribe-form input[type="email"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#hd-subscribe-form button {
    width: 100%;
    padding: 10px;
    background: #0073aa;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#hd-subscribe-form button:hover {
    background: #005f8d;
}

#hd-subscribe-form .hd-msg {
    margin-top: 8px;
    font-size: 13px;
}