the title is kinda self explanatory. since both are borders that are essentially buffers for the thing youre actually here for, it feels appropriate, plus they just look very nice. heres a rough mockup i made for both wikis:
there is something to note, which applies to both the "new" border and the current borders: if the window is less wide than the size of the border, the image doesnt resize nor center, which leads to the center of the image not being at the center of the page.
the obvious next thought is "what if we change the borders based on the page?", and i dont know if it is even possible; however, if it is, i am more than willing to put my money where my mouth is and assign borders to pages myself.
honestly im very neutral on changing it per page, it just feels like a thing people might want because of the borders being dynamic in-game. i am in favor of being able to choose which border you want though