7F7F7F
https://svg-hosting.vercel.app/api/svg?url=https://scrapbox.io/api/code/color/7F7F7F/color.svg
code:color.svg
<svg width="48" height="48" viewBox="0 0 48 48" xmlns="
http://www.w3.org/2000/svg">
<rect x="0" y="0" width="48" height="48" fill="#7F7F7F" stroke="none" />
</svg>