.mc4wp-response.success {
    background-color: #d4edda !important;
    color: #155724 !important;
}
.mc4wp-response.error {
    background-color: #f8d7da !important;
    color: #721c24 !important;
}
.mc4wp-response.success,
.mc4wp-response.error {
    padding: 8px 12px;
    border-radius: 4px;
    margin-top: 10px;
    display: inline-block !important;
}