This is likely because a default “zoom” level has been set in your browser, and this default value is above or below 100%.
For best results, please set your default zoom level at 100%, and if you wish to zoom into the pages, use the “pinch-to-zoom” gesture. This will ensure that you see the book in the way it’s meant to be viewed. If pinch-to-zoom is not available then
- on a Mac, double tap on the magic mouse or ‘CMD(⌘)’ and ’=’ on your keyboard or
- on desktop PC, if pinch-to-zoom is not available, use the magnification tool by pressing ‘Ctrl’ and ’+’ your keyboard.
Please refer to the following video for examples: