.item {
  background: lighten($content_bg, 2%) 50% 50% no-repeat;
  padding-bottom: 100%;
  border-radius: $cell_radius;
  cursor: pointer;
  position: relative;
  width: 100%;

  img {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
  }
}

.thumb {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: $cell_radius;
  background: lighten($content_bg, 2%) 50% 50% no-repeat;
  background-size: cover;
  opacity: 0;
  transition: opacity 0.5s;
  will-change: opacity;

  .is_loaded & {
    opacity: 1;
  }
}

.letters {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  font: $font_24_semibold;
  color: transparentize(white, 0.5);
  border-radius: $cell_radius;
  background-image: linear-gradient(
    180deg,
    transparentize($content_bg, 0.4),
    transparentize($content_bg, 0.4)
  );
}