message: Style(Preview): Modify the button to center vertically
diff: background: rgba(109, 109, 109, 0.6);
  border-radius: 22px;
  justify-content: center;
  - align-items: center;
  &-item {
  + display: flex;
  + height: 100%;
  padding: 0 9px;
  font-size: 24px;
  - line-height: 44px;
  cursor: pointer;
  transition: all 0.2s;
  &__arrow {
  position: absolute;
  top: 50%;
  + display: flex;
  + align-items: center;
  + justify-content: center;
  width: 50px;
  height: 50px;
  font-size: 28px;
  - line-height: 50px;
  - text-align: center;
  cursor: pointer;
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: 50%;
  