Transforming table headers in Rmarkdown ioslides

I am experimenting with creating a custom table format for tables generated using the ioslides_presentation output type in Rmarkdown with Rstudio Version 0.98.1028. However, I'm facing difficulty in modifying the styling of the table headers.

Below is the content of my rmd file:

---
title: "Struggling to Customize Table Headers Using CSS"
author: "John Doe"
date: "September 15, 2021"
output: ioslides_presentation
css: slidetheme.css
---

## Basic Table

A            B           C
---------   --------    --------  
1           2            4
2           3            5

Here's a snippet from my css file:

td, th {
  width: 4rem;
  height: 2rem;
  border: 1px solid #ccc;
  text-align: center;
}

td, tr {background:white; background-color:white; color: black;}

th {
  background: black;
  border-color: white;
}
body {
  padding: 1rem;
}

While the table rows respond to the css adjustments, the header remains unaffected. Despite my efforts, I have not been successful in resolving this issue. Is there anyone who knows how to tackle this problem?

Thank you, Miguel

Answer №1

To successfully customize your ioslides presentation, follow these three steps:

Firstly, update the YAML header to specify the CSS within the ioslides_presentation format, as shown below:

output_format:
  ioslides_presentation:
    css: mycustomtheme.css

Secondly, remember that in CSS, the most specific rule will take precedence. In order to override the default styling for tables in ioslides, make your rules more specific or use !important tag. It's recommended to use web inspector to identify which rule is currently active and adjust accordingly by right-clicking and selecting "Inspect Element" after previewing your slides.

Lastly, since your custom CSS will be combined with ioslides' CSS, ensure you not only add your styles but also remove any unwanted properties set by ioslides to avoid conflicts.

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