Create button remains in background on long lists

[SamuelHassine]

Description

Currently, the "+" button is not in foreground so if the list takes the whole height of the page, the button can not be clicked.

Environment

N/A

Reproducible Steps

1. Create a list of more than 30 elements
2. Try to create something

Expected Output

To be able to click on the button and create something

Actual Output

The button is in background.

Additional information

None.