Set background colour of description in tiles

Question

my tiles look like this:

I know how to change the darker background (from heading) but how can I change the background of the description (shows up when going with mouse over tile) and the surrounding of the heading?

Thanks!!

update: with the code .ms-tileview-tile-descriptionMedium { background-color: red; }

my tile looks like this:

Answer 1

Use ".ms-tileview-tile-detailsBox" class and you can change the backgroundcolor of description box.

refer the below screen to provide description for tile view,

Answer 2

You can use below css and works for me

.ms-tileview-tile-root:hover .ms-tileview-tile-descriptionSmall, 
.ms-tileview-tile-root:hover .ms-tileview-tile-descriptionMedium, 
.ms-tileview-tile-root:hover .ms-tileview-tile-descriptionLarge {
   background-color: blue;
}

To change complete tile description and title background on hover

.ms-tileview-tile-root:hover .ms-tileview-tile-detailsListMedium {
    background-color: blue;
}