.rtec-stripe-form-wrap #card-element {
    padding: 8px;
    margin: 0;
    width: 100%;
    height: auto;
    font-size: 15px;
    line-height: 1.5;
    background: #fff;
    border: 1px solid #ddd;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
}
.rtec-stripe-form-wrap .rtec-stripe-form-field select,
.rtec-stripe-form-wrap .rtec-stripe-form-field input[type=text],
#rtec .rtec-stripe-form-wrap .rtec-stripe-form-field select,
#rtec .rtec-stripe-form-wrap .rtec-stripe-form-field input[type=text]{
    display: block;
    padding: 8px;
    margin: 0;
    width: 100%;
    height: 100%;
    font-size: 15px;
    line-height: 1.5;
    background: #fff;
    border: 1px solid #ddd;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
}

.rtec-stripe-form-wrap .rtec-stripe-form-field label {
    font-size: 15px;
    margin-bottom: 5px;
    line-height: 1;
}

.rtec-stripe-form-wrap .rtec-stripe-form-field {
    margin-bottom: 16px;
}