Polaroid Change background color

Hi,

I created a darker theme,
How can I change the background color for each image display?
Current background is white, behind image and text. https://snipboard.io/hJ6d1H.jpg

EDIT

I thought there might be a few options in settings, but this css did the job:

.fp-playlist-external.fp-playlist-polaroid a h4 span {
color: #e5e5e5;
}

.fp-playlist-external.fp-playlist-polaroid a, .entry-content .fp-playlist-external.fp-playlist-polaroid a {
background: #0a0f14;
border: 10px solid #0a0f14;
}

.fp-playlist-external.fp-playlist-polaroid a:hover, .entry-content .fp-playlist-external.fp-playlist-polaroid a:hover {
background-color: #09161e;
border: 10px solid #09161e;
}