Checking out support for css

gistfile1.txt

.flex-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1em;
}

@supports not (gap: 1em) {
  .flex-container {
    margin: -0.5em;
  }
  .flex-container > * {
    margin: 0.5em;
  }
}