--- title: Passing Your CSS Theme to `canvas` :: Aaron Gustafson description: A practical guide to syncing CSS custom property theme colors (light/dark mode) with HTML canvas rendering. The technique uses `window.getComputedStyle()` to... canonical: https://daily.dev/posts/passing-your-css-theme-to-canvas-aaron-gustafson-nwolh2xgl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Passing Your CSS Theme to `canvas` :: Aaron Gustafson | daily.dev og:description: A practical guide to syncing CSS custom property theme colors (light/dark mode) with HTML canvas rendering. The technique uses `window.getComputedStyle()` to... og:url: https://daily.dev/posts/passing-your-css-theme-to-canvas-aaron-gustafson-nwolh2xgl og:image: https://api.daily.dev/og/posts/NwOlH2XGL.png og:image:alt: Passing Your CSS Theme to `canvas` :: Aaron Gustafson og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Passing Your CSS Theme to `canvas` :: Aaron Gustafson **[Aaron Gustafson](https://daily.dev/sources/aaron_gustafson)** · 3 min read · 0 upvotes · 0 comments ## Summary A practical guide to syncing CSS custom property theme colors (light/dark mode) with HTML canvas rendering. The technique uses `window.getComputedStyle()` to read CSS custom properties into a JavaScript theme object, then attaches a `MediaQueryList` event listener to `prefers-color-scheme` so canvas colors automatically update whenever the user switches themes. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [A few ways of specifying per-theme colours in only CSS — Chris Morgan](https://daily.dev/posts/a-few-ways-of-specifying-per-theme-colours-in-only-css-chris-morgan-yeihwzack) · Lobsters · 0 upvotes · 0 comments - [Color Themes with Baseline CSS Features](https://daily.dev/posts/color-themes-with-baseline-css-features-hqncxlcye) · OddBird · 22 upvotes · 0 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#css](https://daily.dev/tags/css) [View this post on daily.dev](https://daily.dev/posts/passing-your-css-theme-to-canvas-aaron-gustafson-nwolh2xgl) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Passing Your CSS Theme to `canvas` :: Aaron Gustafson","url":"https://daily.dev/posts/passing-your-css-theme-to-canvas-aaron-gustafson-nwolh2xgl","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/passing-your-css-theme-to-canvas-aaron-gustafson-nwolh2xgl"},"datePublished":"2026-07-05T07:21:34.143Z","dateModified":"2026-07-05T07:22:04.771Z","description":"A practical guide to syncing CSS custom property theme colors (light/dark mode) with HTML canvas rendering. 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