"We're tight-fisted with property and money, yet think too little of wasting time, the one thing about which we should all be the toughest misers.”
Seneca

:focus-within

The :focus-within CSS pseudo-class matches an element if the element or any of its descendants are focused. In other words, it represents an element that is itself matched by the :focus pseudo-class or has a descendant that is matched by :focus. (This includes descendants in shadow trees.)
:focus-within css reference