如何在反应虚拟化网格中为所有渲染的项目添加边距（每个框之间的空间）？

我使用 React Virtualized 来显示一些项目。我现在的问题是如何为每个框添加边距以使每个框之间都有空间？

这是一个沙箱，你可以看到所有箱子都有边框，没有空间。我该如何添加空间？

https://codesandbox.io/p/sandbox/react-virtualized-responsive-card-grid-w-infinite-scroll-forked-8kmr8t?file=%2Fsrc%2FApp.tsx

这是我的列表代码

export function VirtualizedGrid<ItemType>({
  items,
  renderItem,
  itemHeight,
  itemMinWidth,
  numColumns,
  registerChild,
  onRowsRendered
}: VirtualizedGridProps<ItemType>): JSX.Element {
  const gridRef = useRef<any>(null);
  const containerRef = useRef<any>(null);
  const containerWidth = containerRef?.current?.clientWidth ?? 0;

  const windowSize = useWindowSize();

  useEffect(() => {
    gridRef.current?.recomputeGridSize();
  }, [windowSize]);

  function calculateColumnCount(width: number) {
    return Math.floor(width / itemMinWidth);
  }

  function calculateItemWidth(width: number, columnCount: number) {
    return width / columnCount;
  }

  const columnCount = numColumns ?? calculateColumnCount(containerWidth);
  const rowCount = Math.ceil(items.length / columnCount);
  const itemWidth = calculateItemWidth(containerWidth, columnCount);

  return (
    <Container ref={containerRef}>
      <WindowScroller>
        {({ height, isScrolling, onChildScroll, scrollTop }) => (
          <AutoSizer disableHeight>
            {() => {
              return (
                <Grid
                  // ref={gridRef}
                  ref={(el) => {
                    registerChild(el);
                    gridRef.current = el;
                  }}
                  autoHeight
                  columnCount={columnCount}
                  columnWidth={itemWidth}
                  width={containerWidth}
                  height={height}
                  rowCount={rowCount}
                  rowHeight={itemHeight}
                  isScrolling={isScrolling}
                  scrollTop={scrollTop}
                  onScroll={onChildScroll}
                  cellRenderer={(props: GridCellProps) => {
                    const fullProps: VirtualizedGridItemProps<ItemType> = {
                      ...props,
                      items,
                      columnCount: columnCount
                    };
                    return renderItem(fullProps);
                  }}
                />
              );
            }}
          </AutoSizer>
        )}
      </WindowScroller>
    </Container>
  );
}