.pt-contact-form-align-center li.wpuf-submit {
     float: none;
     margin: 0 auto !important;
}
 .pt-contact-form-btn-align-center li.wpuf-submit {
     text-align: center;
}
 .pt-contact-form-btn-align-left li.wpuf-submit {
     text-align: left;
}
 .pt-contact-form-btn-align-right li.wpuf-submit {
     text-align: right;
}