.expand-btn {
  bottom: 0;
  color: var(--highlight-foreground);
  cursor: pointer;
  display: none;
  left: 0;
  right: 0;
  position: absolute;
  text-align: center;
}

.fold-cover {
  background-image: linear-gradient(to top, var(--highlight-background) 0, rgba(0, 0, 0, 0) 100%);
  bottom: 0;
  display: none;
  height: 50px;
  left: 0;
  right: 0;
  position: absolute;
}

.highlight-fold {
  max-height: unit(hexo-config('codeblock.fold.height'), 'px');
  overflow-y: hidden !important;

  .expand-btn, .fold-cover {
    display: block;
  }
}