Description

The combo box list doesn't have a high enough z-index to overlap other positioned element such as the buttons for another combo box it could be placed above.

The z-index should be increased to make sure it covers non dialog items.

<img width="459" alt="Screenshot 2020-08-03 09 58 02" src="https://user-images.githubusercontent.com/1385752/89196565-01b64f80-d570-11ea-81e8-1

Describe the bug

When someone reports a proposal and an administrator decide to hide this one, the proposal is still exported in Open Data and admin proposals exports.

To Reproduce
Steps to reproduce the behavior:

1. Report a proposal
2. As administrator, hide this proposal
3. Export proposals with open data and proposals export in administration side
4. See moderated proposal i

Minor recommendation:

Screen readers announce the word 'content' in the 'Skip to content' bypass block in the context of 'feeling content' the inflection is different to the intended meaning of 'the word.

Adding the word 'main' into the mix fixes the pronunciation 'Skip to main content' is vocalized in the correct pronunciation.

Pedantic; I know :-)