CSS Dropdown - Add box-shadow

3

input[type="checkbox"] {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: 0;
  box-shadow: 0px 2px 5px 5px rgba(0,0,0, .3);
  transition: box-shadow .5s;

  &:checked {
    box-shadow: none;
    transition: box-shadow .5s;
  }

  & + nav {
    display: none;
  }
}