Custom theme background color does not show right

## 💬 Question
I set up a custom theme and it correctly shows for only if **filled** appearances.
Yet, components with **appearance="outline"** shows original UI Kitten's theme color for the background color like the image below.

For instance, button's **appearance="filled'** is fine both hover and click has my custom theme color.
However, if I use **appearance="outline"** then the background color is supposed to be the lighter color of the status color (in this case, I set primary color as red and the background color is supposed to be lighter red but it is actually UI Kitten's original theme primary color, which is light purple.

Has anyone solved this issue? It's awful to have this color combination off from our branding colors.

## UI Kitten and Eva version

| Package | Version |
| ----------- | ----------- |
"@eva-design/material": "^2.2.0",
"@ui-kitten/components": "^5.3.1",
"@ui-kitten/eva-icons": "^5.3.1",