TopherLX opened a new issue, #36967:
URL: https://github.com/apache/superset/issues/36967
### Bug description
When using the Light theme, hovering over cells in the Calendar Chart
results in tooltip readability issues and lingering visual artifacts:
**1. Tooltip text is invisible due to color conflict**
The tooltip appears with a white background, but the text is also white,
making it completely unreadable. After inspecting the source code, it seems the
tooltip styling dynamically uses theme variables:
```
background: ${theme.colorBgElevated};
color: ${theme.colorTextLightSolid};
```
In the Light theme, both colorBgElevated and colorTextLightSolid resolve to
white (or very light colors), causing the text to blend into the background.
**File location:**
superset-frontend/plugins/legacy-plugin-chart-calendar/src/ReactCalendar.jsx
_This issue can be solved by CSS Template, but this way is time comsumed._
**2. Persistent hover highlight remains on chart**
When moving the mouse over the Calendar Chart, a background highlight (or
selection-like rectangle) sometimes gets "stuck" on the chart area. This
artifact does not disappear until the page is refreshed—and reappears on
subsequent hovers.
Expected Behavior:
Tooltip text should always be legible against its background, regardless of
theme.
Hover effects should cleanly disappear when the mouse moves away; no
persistent visual elements should remain.
### Screenshots/recordings
<img width="873" height="214" alt="Image"
src="https://github.com/user-attachments/assets/25fc70a0-7381-4a02-b662-17c940dbef76";
/>
### Superset version
6.0.0
### Python version
3.11
### Node version
16
### Browser
Chrome
### Additional context
_No response_
### Checklist
- [x] I have searched Superset docs and Slack and didn't find a solution to
my problem.
- [x] I have searched the GitHub issue tracker and didn't find a similar bug
report.
- [x] I have checked Superset's logs for errors and if I found a relevant
Python stacktrace, I included it here as text in the "additional context"
section.
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