Here’s the CSS for flow
.
.flow { display: flex; flex-flow: row wrap; gap: var(--gap-y, var(--gap)) var(--gap-x, var(--gap));
> .spacer { margin-block-start: auto; }
> *, > :where(.contents) > *, > *:where(astro-island, astro-slot) > * { flex-grow: var(--grow); }}