.dual-list .list-group {
    max-height: 250px;
    overflow-y: scroll;
    height: 250px;
}
.dual-list .list-group::-webkit-scrollbar{
      display: none;
    
}

.list-left li,
.list-right li {
    cursor: pointer;
}

.list-arrows {
    padding-top: 100px;
}

.list-arrows button {
    margin-bottom: 20px;
}