Common Issues ui

Dark Mode Not Working Properly

Your app has a dark mode but it doesn't work correctly. Text becomes invisible against the background, some components stay light while others go dark, the toggle doesn't persist across pages, or the initial flash of the wrong theme is jarring.

Common Causes

  • Some components have hardcoded colors instead of using theme variables
  • Theme preference not saved to localStorage — resets on page reload
  • CSS variables defined for light mode but not for dark mode
  • Third-party components don't respect the app's theme
  • Flash of unstyled content (FOUC) before the theme loads

How to Fix It

  1. Toggle dark mode and inspect elements that look wrong — check if they use theme variables or hardcoded colors
  2. Verify the theme toggle saves the preference to localStorage
  3. Check that all CSS variables have both light and dark mode values
  4. Test every page in dark mode — AI tools often miss some pages
  5. Add a script in the HTML head to apply the theme before the page renders (prevents FOUC)

Real developers can help you.

Matthew Butler Matthew Butler Systems Development Engineer @ Amazon Web Services Victor Denisov Victor Denisov Developer Milan Surelia Milan Surelia Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems. Expertise: 💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web. 🖋️ Sharing insights through technical writing, blogging, and open-source contributions. 🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences. Notable Achievements: 🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX. 🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development. 🌟 Open source contributions on Github & StackOverflow for Flutter & Dart 🎖️ Worked on improving app performance and user experience with smart solutions. Milan is always happy to connect, work on new ideas, and explore the latest in technology. Costea Adrian Costea Adrian Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system. zipking zipking I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify. As an INFJ-T, I approach development with a "systems-thinking" mindset—balancing technical precision with a deep understanding of user needs. I particularly enjoy the challenge of architecting Vertical AI SaaS and optimizing Small Language Models (SLMs) to solve specific, real-world business problems. Whether I'm in a CTO-level leadership role or hands-on with the code, I thrive on building tools that turn complex data into actionable value. Mehdi Ben Haddou Mehdi Ben Haddou - Founder of Chessigma (1M+ users) & many small projects - ex Founding Engineer @Uplane (YC F25) - ex Software Engineer @Amazon and @Booking.com legrab legrab I'll fill this later Krishna Sai Kuncha Krishna Sai Kuncha Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : ) BurnHavoc BurnHavoc Been around fixing other peoples code for 20 years. AUXLE AUXLE I am a Full Stack Developer experienced in building Websites, Web apps and Cross Platform Mobile Apps for Startups and Companies.

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Frequently Asked Questions

Some pages are dark but others aren't. Why?

AI tools often implement dark mode incrementally and miss some pages or components. A developer can audit the entire app and make dark mode consistent.

The app flashes white before going dark. Can this be fixed?

Yes. This is called Flash of Unstyled Content (FOUC). It's fixed by loading the theme preference before the CSS renders, usually with a small script in the HTML head.

Related Common Issues Issues

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