Template:PosterGalleryCSS.css

/* Card frame for each poster */
.ksi-posters .gallerybox .thumb {
  border: 1px solid #777;
  background: #111;
  padding: 6px;
  box-shadow: 0 1px 4px rgba(0,0,0,.4);
}
.ksi-posters .thumb img { display:block; width:100%; height:auto; }

/* Make caption text WHITE (but do not touch links) */
.ksi-posters .gallerytext {
  color: #fff !important;   /* forces non-link caption text to white */
  font-size: 90%;
  padding-top: 4px;
  text-align: center;
}

/* Ensure any non-anchor elements inside captions inherit the white */
.ksi-posters .gallerytext > :not(a),
.ksi-posters .gallerytext > :not(a) * {
  color: #fff !important;
}

/* Do NOT set colors on links – they’ll keep your site’s default link color */