The CSS snippet you provided, .sd8HBBj8 { vertical-align:top; cursor: pointer; ... } , appears to be a typically generated by modern web frameworks or compiled libraries. Common Origins
Because the class name sd8HBBj8 is a non-semantic, randomized string, it is likely produced by one of the following:
: Tools like Styled Components or Emotion generate unique class names at runtime to ensure styles don't "leak" or conflict with other elements on the page.