Este es el código: css

 .dropdown {position: relative;} .dropdown-menu {position: absolute; left: 0; top: 101%; background-color: white; padding: .75rem; border-radius: .25rem; box-shadow: 0 2px 5px 0 rgba(0, 0, 0, .1); opacity: 0; transition: opacity 150ms ease-in-out; } .dropdown.active > .link + .dropdown-menu {opacity: 1;}