Very simple CSS only example, including JS-free toggling: https://codepen.io/theprojectsomething/pen/oNQYqRw https://codepen.io/theprojectsomething/pen/oNQYqRw

Very simple CSS only example, including JS-free toggling: https://codepen.io/theprojectsomething/pen/oNQYqRw https://codepen.io/theprojectsomething/pen/oNQYqRw Note: Could be simplified with the :has selector but it isn't currently supported in Firefox.