The file list is partially visible behind the header

[danxuliu]

When the files vertically overflow the list and the list is scrolled its contents are partially visible behind the file list header.

Origin:

Scrolled:

@nextcloud/designers

[jancborchardt]

It is intended to be slightly visible, however only very slightly with high opacity of the breadcrumb and multiselect bar. Kind of like in iOS - ideally we can use CSS3 blur effect even.