.screen-reader-response {
    display: none;
}

.wpcf7-response-output.wpcf7-mail-sent-ok {
    color: #01cc3f;
}
span.wpcf7-not-valid-tip {
    color: red;
}
.wpcf7-response-output.wpcf7-validation-errors {
    color: red;
}