#payment-form{
    margin-bottom: 20px;
    width: 75%;
}
#payment-form h4{
    color: #777;
}
#payment-form .stripe-form-row #card-element{
    margin-bottom: 20px;
    border: 1px solid #ddd;
    padding: 10px;
}

@media screen and (max-width: 720px) {
    #payment-form{
        width: 100%;
    }
}