Timeline SearchBar overflows the narrow timeline with `BaseCard`

[luixxiul]

Steps to reproduce

1. Open a room
2. Display a room info card or a thread
3. Enable Timeline SearchBar

Outcome

What did you expect?

The input area, the buttons to search and cancel should be displayed.

What happened instead?

The buttons are overlapped by the BaseCard. They are displayed by selecting with tab key.

Operating system

Debian

Browser information

Firefox

URL for webapp

develop.element.io

Application version

No response

Homeserver

No response

Will you send logs?

No

[richvdh]

This only happens when the window is narrow