GitHub user dosubot[bot] added a comment to the discussion: Need an urgent help 
How can i change text color and background of canvas in dark theme

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<!-- Answer -->
Hey @PARKER-X! Here are two ways to change the text color and background in 
dark mode:

**1. Global dark theme config (recommended)**

In your `superset_config.py`, set `THEME_DARK` with the Ant Design tokens that 
control background and text colors 
[[1]](https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/documents/876a241f-01db-445e-a093-f65266ed16ff):

```python
THEME_DARK = {
    "algorithm": "dark",
    "token": {
        "colorPrimary": "#4d9aff",
        "colorBgContainer": "#1a1a2e",   # chart card / container background
        "colorBgLayout": "#0f0f1a",      # page canvas background
        "colorText": "#e0e0e0",          # primary text color
        "colorTextSecondary": "#a0a0a0", # secondary text
    },
}
```

Also make sure the dark mode toggle is enabled in your feature flags 
[[1]](https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/documents/876a241f-01db-445e-a093-f65266ed16ff):

```python
FEATURE_FLAGS = {
    "THEME_ENABLE_DARK_THEME_SWITCH": True,
}
```

The dashboard chart cards use `colorBgContainer` for their background 
[[2]](https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/documents/d88ac24d-e60c-4109-9a23-fb80e716e36a),
 so overriding that token is the key to fixing the white background you're 
seeing in dark mode.

You can experiment with token values using the [Ant Design theme 
editor](https://ant.design/theme-editor).

**2. Per-dashboard CSS override (quick fix)**

If you just need to fix one dashboard, go into edit mode → **⋮ menu** → **Edit 
CSS** and add 
[[3]](https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/documents/dea161cb-f15f-45a8-a1b5-8daa94137e7b):

```css
.dashboard-grid {
    background-color: #1a1a2e !important;
    color: #e0e0e0 !important;
}

.dashboard-component-chart-holder {
    background-color: #1e1e30 !important;
    color: #e0e0e0 !important;
}
```

The global `THEME_DARK` approach (option 1) is the better long-term solution 
since it applies consistently across all dashboards and UI elements. Would you 
like me to look up the full list of available Ant Design tokens that Superset 
exposes?


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GitHub link: 
https://github.com/apache/superset/discussions/42844#discussioncomment-17929726

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