akkoma-fe/src/components/emoji_grid/emoji_grid.scss

.emoji {
  &-grid {
    flex: 1 1 1px;
    position: relative;
    overflow: auto;
    user-select: none;
    mask: linear-gradient(to top, white 0, transparent 100%) bottom no-repeat,
          linear-gradient(to bottom, white 0, transparent 100%) top no-repeat,
          linear-gradient(to top, white, white);
    transition: mask-size 150ms;
    mask-size: 100% 20px, 100% 20px, auto;
    // Autoprefixed seem to ignore this one, and also syntax is different
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    &.scrolled {
      &-top {
        mask-size: 100% 20px, 100% 0, auto;
      }
      &-bottom {
        mask-size: 100% 0, 100% 20px, auto;
      }
    }
    margin-left: 5px;
    min-height: 200px;
  }

  &-group-title {
    position: absolute;
    font-size: 0.85em;
    width: 100%;
    margin: 0;
    height: 24px;
    display: flex;
    align-items: end;

    &.disabled {
        display: none;
    }
  }

  &-item {
    position: absolute;
    width: 32px;
    height: 32px;
    box-sizing: border-box;
    display: flex;
    font-size: 32px;
    align-items: center;
    justify-content: center;
    margin: 4px;

    cursor: pointer;

    img {
      object-fit: contain;
      max-width: 100%;
      max-height: 100%;
    }
  }
}