/**
 * The dnd-list should always have a min-height,
 * otherwise you can't drop into it once it's empty
 */
ul[dnd-list] {
    min-height: 42px;
    padding-left: 0px;
}

/**
 * An element with .dndPlaceholder class will be
 * added to the dnd-list while the user is dragging
 * over it.
 */
ul[dnd-list] .dndPlaceholder {
    background-color: #ddd;
    display: block;
    min-height: 42px;
}
ul[dnd-list] li {
    background-color: #fff;
    border: 1px solid #ddd;
    border-top-right-radius: 4px;
    border-top-left-radius: 4px;
    display: block;
    margin-bottom: -1px;
    padding: 10px 15px;
}

/**
 * Show selected elements in green
 */
ul[dnd-list] .selected {
    background-color: #dff0d8;
    color: #3c763d;
}

.collection-list {
  height: 25rem;
  overflow-y:auto;
}
.dragdemo {
    width: 170px;
    height: 100px;
    line-height: 100px;
    text-align: center;
    border-radius: 6px;
    background: green; color: #efe;
}
.dnd-scroll-area {
  height: 4rem;
  width: 100%;
  background-color:#eee;
}