This is an album with a theme image which is also displayed on small devices like an iPhone.The swipe area on the index page is restricted to the theme image, so that the rest of the page can be used for scrolling through the index page. For a slide page, the whole page is used as swipe area.
For an even better usability on small screens, the viewer can enlarge the size of the buttons and if the viewer has troubles reading small letters, he can also enlarge the font-size in the viewer settings (Settings button in the upper right corner). On an iPhone in landscape mode, the toolbar is moved to the bottom, because buttons on the top can't be used on an iPhone in full screen mode.
Variable thumbnail sizes with the Justified Gallery are used, the specified thumbnails size is 600x120 and the Justified-Gallery uses a row heigth of 15% of the screen height.