Files app: Fix selection menu bg color when menu is shown

The #selection-menu-button uses <files-toggle-ripple> which sets the
background based on a translucent white background, but because the
button is already white it isn't visible. Setting the background-color
to black, changes the ripple to use a translucent black for which
becomes visible.

Bug: 917326
Change-Id: I3054ee1257ac541f9fd868a2c999abd6ca7a6e96
Commit-Queue: Luciano Pacheco <>
Commit-Queue: Noel Gordon <>
Auto-Submit: Luciano Pacheco <>
Reviewed-by: Noel Gordon <>
Cr-Commit-Position: refs/heads/master@{#670834}
1 file changed