Rakuten is special

https://cdn-ak.f.st-hatena.com/images/fotolife/o/orangeitems...

https://d2l930y2yx77uc.cloudfront.net/production/uploads/ima...

https://www.naenote.net/wp-content/uploads/2018/05/45b33593e...

That's all created by the seller, not by Rakuten though. You can do the same on Amazon (at least in Japan, idk about other Amazon)

According to some accounts I've seen, Rakuten sales/support not just encourage but instruct sellers to do this until they oblige

Scroll down on certain Amazon listings and you'll find similar graphics from the seller. The difference here is that atleast the Japanese ones look nice.

Honestly, I think Amazon and eBay look terrible.

Yeah, they're not designed to look good, they're designed to sell.