The code snippet .hhc9Uuk6 { vertical-align:top; cursor: pointer; ... } is an example of or scoped CSS , which is typically created by modern web development frameworks like React , Vue , or CSS-in-JS libraries such as styled-components . What this code does

: Shorter class names make the website load faster.

: This is the class selector . The randomized string (e.g., hhc9Uuk6 ) is a "hash" used to ensure the style only applies to one specific component, preventing it from accidentally affecting other parts of the website.

: On large sites, two developers might both use a class named .header . Scoping them with unique hashes prevents styles from clashing. How to see it in action