Deprecation warning banner is unreadable on the page of archived docs sites

Hi, maintainers,

Thank you for maintaining [kubernetes.io](https://kubernetes.io/)! I'm new to contributing to Kubernetes. If I'm missing something, please let me know.

Also, I'm willing to fix this issue if it's confirmed as a bug. Thank you!

---

**This is a Bug Report**

**Problem:**
The `deprecation_warning` has readability issues in these part of website.

| path | as is|
|---|---|
| `/` | |
| `/community` | |
| `/partners` | |

**Proposed Solution:**
- Change the background color to `$dark-bg-color-1` to make it readable.
- I have created PRs to these each branch.
- `release-1.35` https://github.com/kubernetes/website/pull/56836
- `release-1.34` https://github.com/kubernetes/website/pull/56837
- `release-1.33` https://github.com/kubernetes/website/pull/56838
- `release-1.32` https://github.com/kubernetes/website/pull/56839

**Pages to Update:**
- https://v1-35.docs.kubernetes.io/
- https://v1-34.docs.kubernetes.io/
- https://v1-33.docs.kubernetes.io/
- https://v1-32.docs.kubernetes.io/

Commit hash where I've confirmed this bug: 2dddedb4e03d (the latest commit as of August 5th, 2026 at 10:54 PM JST)