form ul {
  display: grid;
  grid-template-columns: min-content 1fr;
  gap: 24px;
}

@supports (grid-template-columns: subgrid) {
  form ul li {
    grid-column: 1 /-1;
    display: grid;
    grid-template-columns: subgrid;
    /* display: contents; */
  }
}
@supports not (grid-template-columns: subgrid) {
  form ul li {
    display: contents;
  }
}