#scrollbox3 {
    overflow: auto;
    width: 250px;
    height: 189px;
    padding: 0 5px;
    /*border: 1px solid #b7b7b7;*/
}
#scrollbox4 {
    overflow: auto;
    width: 250px;
    height: 189px;/*155px;*/
    padding: 0 5px;
    /*border: 1px solid #b7b7b7;*/
}

.track3 {
    width: 10px;
    background: rgba(0, 0, 0, 0);
    margin-right: 2px;
    border-radius: 10px;
    -webkit-transition: background 250ms linear;
    transition: background 250ms linear;
}

.track3:hover,
.track3.dragging {
    background: #d9d9d9; /* Browsers without rgba support */
    background: rgba(0, 0, 0, 0.15);
}

.handle3 {
    width: 7px;
    right: 0;
    background: #999;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 7px;
    -webkit-transition: width 250ms;
    transition: width 250ms;
}

.track3:hover .handle3,
.track3.dragging .handle3 {
    width: 10px;
}