claude-code - 💡(How to fix) Fix [BUG] Code block contrast too low in Claude Code web UI (3+ days) [1 participants]

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anthropics/claude-code#54896Fetched 2026-05-01 05:51:36
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Error Message

Error Messages/Logs

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Code blocks in Claude Code web UI have extremely low contrast since ~April 27. Block background is nearly identical to page background, and comment text is barely visible.

<img width="756" height="410" alt="Image" src="https://github.com/user-attachments/assets/daba5b45-3771-4186-a36f-3ec99872e5c2" />

What Should Happen?

Code block background and text should have sufficient contrast to be readable.

Error Messages/Logs

Steps to Reproduce

  1. Open Claude Code on the web (claude.ai)
  2. View any response containing a code block

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Latest (on the web)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

No response

extent analysis

TL;DR

The issue can likely be resolved by adjusting the CSS styles for code blocks in the Claude Code web UI to increase contrast between the block background and text.

Guidance

  • Verify the issue by checking the CSS styles applied to code blocks in the Claude Code web UI, specifically looking for any recent changes that may have introduced the low contrast.
  • Inspect the HTML elements of the code blocks to identify the classes or IDs used for styling, which can help in pinpointing the exact CSS rules that need adjustment.
  • Consider reaching out to the development team or checking the project's CSS files for any updates or modifications made around April 27 that could be related to the issue.
  • If possible, try to override the CSS styles locally to test if increasing the contrast resolves the readability issue.

Example

No specific code example can be provided without access to the CSS files or more details on the HTML structure of the code blocks in the Claude Code web UI.

Notes

The solution depends on identifying and modifying the specific CSS rules responsible for the styling of code blocks. Without direct access to the codebase or more detailed information on the changes made around the time the issue started, providing a precise fix is challenging.

Recommendation

Apply a workaround by manually adjusting the CSS styles for code blocks in the browser's developer tools to increase contrast, and then report the specific changes needed to the development team for a permanent fix. This approach allows for immediate mitigation of the issue while awaiting a formal update.

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claude-code - 💡(How to fix) Fix [BUG] Code block contrast too low in Claude Code web UI (3+ days) [1 participants]