.dnd_wrp {}

 .dnd_draggable {
     border-top: 2px solid transparent;
     display: flex;
     flex-direction: row;
     align-items: stretch;
 }

 .dng_drag {
     border-top: 2px solid transparent;
 }

 .dng_over {
     border-top: 2px dotted gray;
 }