Add below CSS in your style.css

.nf-form-fields-required  {
  display: none;
}
.nf-field-label label {
  font-weight: 400!important;
}
.nf-form-content input:not([type="button"])  {
  background: #fff!important;
}
.nf-form-content .ninja-forms-field {
  background: #fff!important;
}
.nf-form-content input[type="submit"] {
  background: color(6)!important;
  font-family: 'Inter'!important;
  padding: 12px 30px!important;
  border-radius: 4px!important;
  cursor: pointer!important;
}
.nf-form-content input[type="submit"]:hover {
  color: #fff!important;
  background: color(7)!important;
}