Navbar too small on overflowing pages

[puehringer]

• Release number or git hash: 2.1.1
• Web browser version and OS: Chrome Version 75.0.3770.142
• Environment (local or deployed): Local and Deployed

Steps to reproduce

1. Visit https://stratomex.caleydoapp.org (or any app utilizing the phovea header)
2. Force the page into scrolling mode (by opening dev tools for example)

Observed behavior

Navbar is becoming too small (not fitting to content, but min-width: 28px)

Expected behavior

• Navbar size stays the same (fits content).

Possible fix

Remove the height: 100% in https://github.com/phovea/phovea_clue/blob/develop/src/styles/_base.scss#L103
This fixes the navbar, but side effects may occur.
Alternatively, the navbar min-height can be changed from 28px to auto to always fit the content. This is defined in phovea_ui (https://github.com/phovea/phovea_ui/blob/develop/src/styles/_header_navbar.scss#L7).

[thinkh]

Issue moved to phovea/phovea_ui #68 via ZenHub