Background colour for div attributes & font size for chunks in Positron Visual Mode

Positron Version: 2025.08.0 build 130
Code - OSS Version: 1.102.0
Commit: https://github.com/posit-dev/positron/commit/76ddce53e85437b013671fe7d91a3a1c54f48341
Date: 2025-08-01T20:08:51.894Z
Electron: 35.6.0
Chromium: 134.0.6998.205
Node.js: 22.15.1
V8: 13.4.114.21-electron.0
OS: Darwin arm64 23.6.0

Session details: R version 4.4.2 (2024-10-31)

Describe the issue:

The background of sections surrounded by "Div attributes" in visual mode for Positron is difficult to distinguish from other parts because it is not highlighted unlike in RStudio.
I would like to change the font size for the contents of chunks separately from the main text in the visual mode for Positron.

↑↑ RStudio

---

↑↑Positron

Expected or desired behavior:

1. I would like to set a different background colour to the parts for div attributes like in RStudio.
2. I would like to set a different font size to R chunks from the main text like in RStudio.

Could anyone please help with these issues? Is it possible to achieve them just by changing the settings.json?
Thank you very much in advance.

Start by checking Positron Visual Mode and the settings.json options referenced in the issue. Determine where div-attribute backgrounds and R chunk text sizing are controlled, then verify that each can be configured separately from the surrounding visual-mode text as requested.