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;
}