Align speakers section design with the current theme

Here is the Figma design reference for the task: [Figma Link](https://www.figma.com/design/b6ATTEJWCXvnQQoFjdijLu/PyConf-Hyderabad-2026?node-id=307-2&t=d9r4Hy1M9Nqhhe6l-0)

Attached image:

![Image](https://github.com/user-attachments/assets/410effb1-e5be-4d26-ab6d-c8ec32508341)
