--- title: CSS Refactoring with an AI Safety Net | daily.dev description: A developer shares a technique for safely refactoring messy CSS using Claude Code as an AI assistant combined with Playwright-based screenshot capture and... canonical: https://daily.dev/posts/css-refactoring-with-an-ai-safety-net-ptgflbwq7 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: CSS Refactoring with an AI Safety Net | daily.dev og:description: A developer shares a technique for safely refactoring messy CSS using Claude Code as an AI assistant combined with Playwright-based screenshot capture and... og:url: https://daily.dev/posts/css-refactoring-with-an-ai-safety-net-ptgflbwq7 og:image: https://api.daily.dev/og/posts/pTgfLbWQ7.png og:image:alt: CSS Refactoring with an AI Safety Net 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. # CSS Refactoring with an AI Safety Net **[RUBYLAND](https://daily.dev/sources/rubyla)** · 10 min read · 0 upvotes · 0 comments ## Summary A developer shares a technique for safely refactoring messy CSS using Claude Code as an AI assistant combined with Playwright-based screenshot capture and AI-powered visual diffing. The approach involves a 7-phase refactor plan targeting CSS cascade layers, deduplication, a modern reset, and CSS variables. After each phase, Playwright captures screenshots of all meaningful app states, and Claude compares baseline vs. post-phase screenshots to detect visual regressions in plain English. The method caught a subtle line-height change from a reset replacement that manual review would likely have missed. The post also compares this AI diffing approach to Playwright's built-in visual testing and Percy, noting trade-offs around actionability vs. cost at scale. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Refactoring AI](https://daily.dev/posts/refactoring-ai-lrubjkakz) · Larablog · 0 upvotes · 0 comments - [How AI Agents Replace DOM Scraping with Component-Aware Static Analysis](https://daily.dev/posts/how-ai-agents-replace-dom-scraping-with-component-aware-static-analysis-rmpqjxavb) · monday Engineering · 2 upvotes · 0 comments --- Tags: [#css](https://daily.dev/tags/css), [#claude-code](https://daily.dev/tags/claude-code) [View this post on daily.dev](https://daily.dev/posts/css-refactoring-with-an-ai-safety-net-ptgflbwq7) ```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":"CSS Refactoring with an AI Safety Net","url":"https://daily.dev/posts/css-refactoring-with-an-ai-safety-net-ptgflbwq7","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/css-refactoring-with-an-ai-safety-net-ptgflbwq7"},"datePublished":"2026-03-15T13:31:39.818Z","dateModified":"2026-03-15T13:32:04.359Z","description":"A developer shares a technique for safely refactoring messy CSS using Claude Code as an AI assistant combined with Playwright-based screenshot capture and...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/92149021f830ec6c2e4ea5728a61d00c?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/92149021f830ec6c2e4ea5728a61d00c?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"RUBYLAND","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"RUBYLAND","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/rubyla","url":"https://daily.dev/sources/rubyla"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/css-refactoring-with-an-ai-safety-net-ptgflbwq7","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"css,claude-code","timeRequired":"PT10M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"RUBYLAND","item":"https://daily.dev/sources/rubyla"},{"@type":"ListItem","position":3,"name":"CSS Refactoring with an AI Safety Net"}]} ```