I have customized the colors of my Discourse instance to use a dark background color, however syntax highlighting does not look good anymore. What is the easiest way to tell highlight.js to use a different style?

Unfortunately it looks like it isn’t working correctly. I copy/pasted the CSS from the Agate theme to a new section in Admin / Customize / CSS: [immagine] However I get the following results: [immagine] (Link to the page: Some thoughts on beta 1.4 - appleseed Users Forum ) Notice that the .hl…

Looks like I would need to add !important to each CSS property… Is anyone aware of a better solution? Edit: it doesn’t look like the !important solution would even work…

Nope, it’s because the default has a higher specificity - .hljs-tag .hljs-string . You need to replicate the theme’s rule with that selector.

Thanks @riking , I hadn’t seen this. Unfortunately that means it’s basically impossible to try highlight.js themes (from their demo page ) to find one that fits the color palette of my Discourse instance without inspecting and tweaking them, one rule at a time… So I guess my original question remain…

Just bumping this in case anyone else has found a nice way of importing nicer and more colourful styles for syntax highlighting of code? Something that looks more like a modern code editor’s view. Custom CSS would be an acceptable solution, wondered if anyone has either put suitable CSS in a CDN fo…

I agree it is pretty fiddly overriding what we have. Highlight ships with a big pile of themes at: [immagine] highlight.js/src/styles at main · highlightjs/highlight.js JavaScript syntax highlighter with language auto-detection and zero dependencies. - highlightjs/highlight.js …

I made a theme component that allows admins to select a hljs theme from a dropdown. More details here [immagine] Codeblock Theme Picker Theme component discourse2 Summary Codeblock Theme Picker will allow you to easily change the theme used in code blocks. e…

Change highlight.js styles?

Supporto

Johani (Joe) 1 Aprile 2020, 6:53am 11

Ho creato un componente tema che consente agli amministratori di selezionare un tema hljs da un menu a tendina. Maggiori dettagli qui

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Choosing code highlight styles Support	5	1265	Gennaio 8, 2019
(old) method for adding languages to highlight.js on Discourse Development	13	7700	Gennaio 22, 2024
Allow users to select Highlightjs theme Feature	0	401	Luglio 22, 2021
"New reply/prop/etc" highlight color has disappeared on only one of my themes Support	3	110	Maggio 18, 2025
Codeblock Theme Picker Theme component codeblock-theme-picker , official	18	4975	Gennaio 19, 2026

Change highlight.js styles?

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