With "Content Fit Magazine", all content (including animations) scales proportionally to 100% page width of the display or browser. If proportional scaling causes content to go out of sight, you can scroll and view it.
This content fit strategy is ideal for pages that are designed as long wallpapers and therefore use scrolling anyway.
If you only want to create a layout that will be displayed in portrait, landscape, tablet and phone, the design of the pages should be in portrait orientation. This makes the layout most flexible and independent of the aspect ratio of the different displays.