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dify - 💡(How to fix) Fix Bug: Markdown Table Expand Modal has transparent background (CSS missing) in Web UI [4 comments, 2 participants]

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langgenius/dify#35532•Fetched 2026-04-24 06:14:07
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Root Cause

When a user interacts with a published Basic Chatbot and the AI generates a Markdown table, clicking the "Expand / Full Screen" icon on the table opens a modal that lacks a solid background colour. Because the modal is transparent, the underlying chat history bleeds through, making the expanded table completely unreadable. <img width="1127" height="676" alt="Image" src="https://github.com/user-attachments/assets/d2a4d06e-41de-4637-a219-a3c9aae66a50" />

RAW_BUFFERClick to expand / collapse

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  • I have read the Contributing Guide and Language Policy.
  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
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  • 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：）
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Dify version

Version1.13.3

Cloud or Self Hosted

Cloud

Steps to reproduce

  1. Create a Basic Chatbot app and publish it.
  2. Prompt the AI to generate a Markdown table large enough to trigger the "Expand" icon.
  3. Click the "Expand" icon on the top right of the table.
  4. Observe the text overlapping with the chat history behind it.

Environment details

  • OS: Ubuntu 22.04 (Nectar Cloud)
  • Installation Method: Docker Compose
  • Browser: Google Chrome

✔️ Expected Behavior

The expanded table modal should have a solid background colour (e.g., background-colour: white; or the dark-mode equivalent) applied to its container to obscure the chat history beneath it.

❌ Actual Behavior

When a user interacts with a published Basic Chatbot and the AI generates a Markdown table, clicking the "Expand / Full Screen" icon on the table opens a modal that lacks a solid background colour. Because the modal is transparent, the underlying chat history bleeds through, making the expanded table completely unreadable. <img width="1127" height="676" alt="Image" src="https://github.com/user-attachments/assets/d2a4d06e-41de-4637-a219-a3c9aae66a50" />

extent analysis

TL;DR

Apply a solid background color to the expanded table modal container to obscure the chat history beneath it.

Guidance

  • Verify that the CSS styles for the modal container are correctly applied, checking for any overriding styles that might cause the transparency issue.
  • Inspect the HTML structure of the expanded table modal to ensure it has a container element that can be targeted with CSS for background color application.
  • Check the CSS files or stylesheets used in the Basic Chatbot app for any existing rules that might be setting the background color of the modal container to transparent or none.
  • Test applying a solid background color to the modal container using the browser's developer tools to confirm the fix before implementing it in the code.

Example

.expanded-table-modal {
  background-color: white; /* or the dark-mode equivalent */
}

Notes

The provided image and description suggest a CSS styling issue, but without access to the codebase, it's difficult to provide a precise fix. The suggested CSS example is a common approach to applying a background color.

Recommendation

Apply a workaround by adding a solid background color to the expanded table modal container, as this is a targeted fix that addresses the reported issue directly.

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dify - 💡(How to fix) Fix Bug: Markdown Table Expand Modal has transparent background (CSS missing) in Web UI [4 comments, 2 participants]