RMarkdown 演示文稿中的滚动幻灯片 (revealjs)

Question

我正在尝试在所有幻灯片的 Revealjs 演示文稿中激活垂直滚动选项。

我尝试直接在 .Rmd 中的 css 中添加溢出选项，这使得滚动条出现在演示文稿上，但我的幻灯片仍然溢出，并且无法向下滚动。

我在这里做错了什么？谢谢

---
title: "Untitled"
author: ""
date: "16 August 2018"
output: revealjs::revealjs_presentation
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = FALSE)
```

```{css}
body {
    overflow: scroll;
}
```

# R Markdown

## Slide with Bullets

This is a very very very long slide.
Very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very long

Answer 1

我能够使用以下方法来做到这一点：

.slide {
    height: 750px;
    overflow-y: auto !important;
}

您可以将其添加到 css 样式的演示文稿中，

<style>
.slide {
    height: 750px;
    overflow-y: auto !important;
}
</style>

...或者在原始问题中的代码块中。

请注意，只有当我还指定了高度以及溢出-y 选项时，这才对我有用。