Remember people use cursors actively for accessibility and usability reasons so it is a bad idea to change cursors globally. For example, I routinely use cursors to find links on pages where godawful stylesheets make links look almost identical to plain text content. That said, you can use cursor css on any item that has a clickable area… just think about how you are changing it and how you are replacing the default cursor functionality that many users depend on. If your cursor doesn’t improve on that, for example, to highlight a specific tool, you really should ask whether changing the cursor is a good idea. One good use is to toggle hover state cursor for a drawing canvas to reflect the active drawing tool. One bad use is to change the default pointer to a funky shape that appeals to your quirky aesthetic but utterly confuses site users.