Gallery Series colouring

### Frontend:
Looking at frontend the Gallery series, seem to be rendered like the following:

| opinion | news |
| ----------- | ---------- |
| ![opinion][] | ![news][] |

[opinion]: https://github.com/user-attachments/assets/e2b1653f-5779-4c78-aff0-4e89f7a439ed
[news]: https://github.com/user-attachments/assets/8b46d078-4d2e-4c7b-88be-1718c61ae532

| arts | sports |
| ----------- | ---------- |
| ![arts][] | ![sports][] |

[arts]: https://github.com/user-attachments/assets/fb336aeb-bd32-414d-a746-f360e2ee58c9
[sports]: https://github.com/user-attachments/assets/aac5daf3-3d4c-4950-814a-0e2c2ff0df24

| lifestyle | special-report |
| ----------- | ---------- |
| ![lifestyle][] | ![special-report][] |

[lifestyle]: https://github.com/user-attachments/assets/952081b1-30c8-475f-ae7d-318eda543b1a
[special-report]: https://github.com/user-attachments/assets/07c86671-6816-4afb-98f4-fd0344ef9d79

### DCAR light mode:
In DCAR migration, this is how we worked through them for light mode:

### AR dark mode:
In AR the dark mode seems to always be like this (it doesn't change based on the pillar):

### DCAR dark mode (proposal):
As an improvement, we could set the dark mode in DCAR like this: