UI: Warning box not centered on 404 error page when visiting another user's task #20369

Description

When visiting a task of another user and encountering a 404 error page, the warning box displaying path-based app access information is not horizontally centered on the page.

Steps to Reproduce

1. Navigate to a task URL belonging to another user
2. Observe the 404 error page with the warning box

Expected Behavior

The warning box should be horizontally centered on the page, consistent with the rest of the error page layout (the "404 - Application Not Found" text and "Back to site" button are properly centered).

Current Behavior

The warning box appears to be left-aligned rather than centered.

Screenshot

Note: Screenshot shows the warning box with text about path-based apps with "owner" share level is not centered on the page.

Context

• The warning displays: "path-based apps with 'owner' share level are only accessible by the workspace owner (see --dangerous-allow-path-app-site-owner-access)"
• This appears to be a CSS/layout issue affecting the visual consistency of the error page