添加一些底部边距，并降低图像的高度。

.stacked-img img {
  margin-bottom: 8em;
  height: 85vh;
}

在这里，我为pandoc div定义了一个类.stacked-img来 Package 所有的图像。完整的reprex（除了图像链接！但应该适用于任何图像）如下所示：

---
title: "Stacked"
format: 
  revealjs:
    css: logo.css
editor: source
---

## First Slide

::::{.stacked-img layout-ncol=2}

::: {.r-stack}

![](statehouse.jpg){.fragment}

::: rotate-img-3
![](grumbach.png){.fragment}
:::

::: rotate-img-354
![](increasingly.jpg){.fragment}
:::

::: rotate-img-9
![](red_state.jpg){.fragment}
:::

::: rotate-img-348
![](dynamic_dem.jpg){.fragment}
:::
:::

::: {.r-stack}

![](538_1.png){.fragment}

::: rotate-img-3
![](538_2.png){.fragment}
:::

::: rotate-img-354
![](538_3.png){.fragment}
:::

::: rotate-img-9
![](538_4.png){.fragment}
:::

:::

::::

logo.css

.rotate-img-3 img {
  transform: rotate(3deg);
}

.rotate-img-9 img {
  transform: rotate(9deg);
}

.rotate-img-354 img {
  transform: rotate(354deg);
}

.rotate-img-348 img {
  transform: rotate(348deg);
}

.stacked-img img {
  margin-bottom: 8em;
  height: 85vh;
}