Template:PosterGalleryCSS.css

/* Template:PosterGallery/styles.css */
.ksi-posters .gallerybox .thumb {
  border: 1px solid #777;
  background: #111;         /* dark card behind the image */
  padding: 6px;             /* space between border and image */
  box-shadow: 0 1px 4px rgba(0,0,0,.4);
}
.ksi-posters .thumb img { display: block; width: 100%; height: auto; }
.ksi-posters .gallerytext {
  color: #c9c9c9;           /* caption color on dark bg */
  font-size: 90%;
  padding-top: 4px;
  text-align: center;
}