bootstrap4.css
.form-check-inline {
  display: -ms-inline-flexbox;
  display: inline-flex;
  -ms-flex-align: center;
  align-items: center;
  padding-left: 0;
  margin-right: 0.75rem;
}
bootstrap4.css
.form-check-inline .form-check-input {
  position: static;
  margin-top: 0;
  margin-right: 0.3125rem;
  margin-left: 0;
}