li:before {
    position: absolute;
    top: 50%;
    content: "";
    left: 0;
    -ms-transform: translateY(-50%);
    -webkit-transform: translateY(-50%);
    transform: translateY(-50%);
    display: block;
    width: 1px;
    height: 25px;
    background-color: #e5e5e5
}