Because idea is to have paper background for some content like we have for Encounters and some other events.
I'm gonna create Animated CSS like when You select item and little table to look like items in game, these things can thankfuly be made just with CSS. Paper background will be used for stuff like for example Goblins Cards You can see in Enemy page I created ( and used like 200 hours of my life in it already xD )
On top of that these paper pages can be easily animated so for example if You hover Your mouse over it paper can tilt or move like normal "paper page"
That's why I translated message using ChatGPT so he don't have to struggle and waste stamina on attempts :P