.wpcf7-response-output{
    margin: 0!important;
    padding: 0!important; 
}

.wpcf7 form.sent .wpcf7-response-output{
    color: #46b450;
    border: none;
}

.wpcf7 form.invalid .wpcf7-response-output, 
.wpcf7 form.unaccepted .wpcf7-response-output, 
.wpcf7 form.payment-required .wpcf7-response-output{
    color: red;
    border: none;
}