.np-dropfade,.np-dropfade-enter{opacity:0;overflow:hidden;height:0}.np-dropfade-enter-active{transition:height .15s ease-in,opacity .15s ease-in .15s;opacity:1}.np-dropfade-enter-done,.np-dropfade-exit{opacity:1;height:auto}.np-dropfade-exit-active{transition:opacity .15s ease-in,height .15s ease-in .15s;opacity:0}