在R Markdown演示文稿中覆盖reveal.js

Question

我试图将一个揭示-js演示文稿整合在一起但是在覆盖默认的css主题时遇到了麻烦。我想从我的情节图像中删除边框。根据文档，这应该工作：

但它没有，我猜是因为这种覆盖不是更具体。但我的问题是我通常提高特异性的方法也不起作用：

## Slide with Plot
<section class = "no-border">
```{r pressure}
plot(pressure)
```
</section>

这是YAML标题：

title: "Title"
author: "..."
date: '`r paste(format(Sys.Date(),"%d")," ", mymonths[sys.man], ", ",
                format(Sys.Date(),"%Y"), sep = "")`'
output:
  revealjs::revealjs_presentation:
    incremental: true
    includes:
      in_header: slidy_bootstrap_header.html
      css: slidyStandard.css

这是css-override：

section.no-border > img {
  background:none; 
  border:none; 
  box-shadow:none;
 }

有谁知道我做错了什么？

Answer 1

我意识到我已将自定义css放在YAML-header中的错误位置。因此，它没有用。

以下是使用自定义css的可重现代码：

---
title: "Untitled"
output: 
  revealjs::revealjs_presentation:
    css: custom2.css
---

## R Markdown

This is an R Markdown presentation. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>.

When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document.

## Slide with Bullets

- Bullet 1
- Bullet 2
- Bullet 3

## Slide with R Code and Output

```{r}
summary(cars)
```

## Slide with Plot

```{r, echo=FALSE}
plot(cars)
```

和css：

.reveal section img {
  margin: 15px 0px;
  background: rgba(255, 255, 255, 0.12);
  border: none;
  box-shadow: none; 
  }

Answer 2

问题似乎是，您的<section>标记未包含在源代码及其输出中。你能做的就是使用jQuery：

---
title: "Title"
author: "..."
output:
  revealjs::revealjs_presentation:
    incremental: true
    includes:
      css: slidyStandard.css
---

<!-- Include jQuery -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

<!-- Add class to img elements -->
<script type="text/javascript">
$(document).ready(function() {
  $elms = $('p > img');
  $elms.addClass('no-border');
});
</script>

<!-- define no-border class -->
<style>
.no-border {
  border: 0px !important;
}
</style>

```{r pressure}
plot(pressure)
```