Because the background-color used to have opacity 0.75 to let the users feel like the tabs are floated on the list/tiles views, the height of the list/tiles views were extended to the screen bottom and so does the scroll bar. To be sync with this, the last element in the list/tiles views also used `last-child` style to adjust the position so that the users are able to scroll to the end of the views. And if we are removing the opacity, the background-color will become black which I think it's not floated on the list/tiles views any more, so we should also remove the `last-child` style for the list/tiles, and the height of list/tiles views should not extend to the screen bottom, should be extend to the top of the tabs.