theme-color - HTML: HyperText Markup Language | MDN

PHOTO EMBED

Wed Dec 20 2023 07:24:43 GMT+0000 (Coordinated Universal Time)

Saved by @zaryabmalik 

<meta name="theme-color" media="(prefers-color-scheme: light)" content="cyan" />
<meta name="theme-color" media="(prefers-color-scheme: dark)" content="black" />
content_copyCOPY

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta/name/theme-color