#pbn-subscription-form-opt2 {
    max-width: 400px;
    margin: 0 auto;
}

#pbn-subscription-form-opt2 input {
    display: block;
    width: 100%;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #555;
    color: #fff;
    border: none;
    border-radius: 5px;
    box-sizing: border-box;
}

#pbn-subscription-form-opt2 input::placeholder {
    color: #fff;
}

#pbn-subscription-message-opt2 {
    margin-top: 15px;
}