lbry-desktop/ui/scss/component/_expandable.scss

.expandable {
  margin-bottom: var(--spacing-medium);
  padding-bottom: var(--spacing-medium);

  [data-mode='dark'] & {
    border-color: var(--dm-color-04);
  }
}

.expandable--closed,
.expandable--open {
  margin-bottom: var(--spacing-small);
}

.expandable--closed {
  max-height: 10rem;
  overflow: hidden;
  position: relative;

  &::after {
    width: 100%;
    height: 40%;
    bottom: 0;
    left: 0;
    pointer-events: none;

    background-image: linear-gradient(to bottom, transparent 0%, mix($lbry-white, $lbry-gray-1, 70%) 90%);
    content: '';
    position: absolute;

    [data-mode='dark'] & {
      background-image: linear-gradient(to bottom, transparent 0%, var(--dm-color-08) 90%);
    }
  }
}

.expandable--open {
  max-height: 100%;
}