.file-row{transition:background-color .3s}.file-row.dragging{background-color:#f0f0f0}.fade-enter{opacity:0}.fade-enter-active{opacity:1;transition:opacity .5s ease-in}.fade-exit{opacity:1}.fade-exit-active{opacity:0;transition:opacity .5s ease-in}.new-group-placeholder{text-align:center;color:#999;border:2px dashed #ccc;padding:10px}