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.

Yovel Cohen Yovel Cohen I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well. Jen Jacobsen Jen Jacobsen I’m a Full-Stack Developer with over 10 years of experience building modern web and mobile applications. I enjoy working across the full product lifecycle — turning ideas into real, well-built products that are intuitive for users and scalable for businesses. I particularly enjoy building mobile apps, modern web platforms, and solving complex technical problems in a way that keeps systems clean, reliable, and easy to maintain. 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. BurnHavoc BurnHavoc Been around fixing other peoples code for 20 years. Simon A. Simon A. I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows. Jared Hasson Jared Hasson Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever Alvin Voo Alvin Voo I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing. My expertise lies in the critical backend infrastructure: the parts that must be fast, secure, and scalable. I thrive on high-pressure environments, such as when I had only three weeks to architect and launch an Ethereum redemption system with minimal prior crypto knowledge, turning it into a major revenue stream. What I bring to your project: Forensic Debugging: I don't just "patch" bugs; I use tools like Datadog and Explain Analyzers to map out bottlenecks and resolve root causes—like significantly reducing memory usage by optimizing complex DB joins. Full-Stack Context: Deep experience in Node.js and React, ensuring backends play perfectly with mobile and web teams. Sanity in the Age of AI: I bridge the gap between "best practices" and modern speed, ensuring your project isn't just built fast, but built to last. 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 Kingsley Omage Kingsley Omage Fullstack software engineer passionate about AI Agents, blockchain, LLMs. Jaime Orts-Caroff Jaime Orts-Caroff I'm a Senior Android developer, open to work in various fields

Describe what's wrong in plain English. No technical knowledge needed.

Get Help

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

Can't fix it yourself?
Real developers can help.

You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.

Get Help