Why? At least it's not hot pink or otherwise eye-blinding. I still find it charming that many Japanese sites seem stuck in 90s web design. But recently I've been running into more Japanese sites that seem to have advanced to mid-2000s web design, with proper CSS and designs that use curves and angles and don't force everything into a box shape (visible or invisible)! That's my favorite era so I hope it's a while before they join the rest of us in bloated SPA hell.