[BUG] Team Page > The Board Section: Background Matches Navigation Bar

**Expected:**
Background a grey tone, different from navigation bar.
<img width="1440" alt="Image" src="https://github.com/user-attachments/assets/83c65f62-5b3d-46ee-8795-60bf58a3569a" />

**Actual:**
<img width="1438" alt="Image" src="https://github.com/user-attachments/assets/af072e07-5e9c-443e-9301-19e0ccf90f82" />
