.dtArrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 55px;
    height: 55px;
    line-height: 55px;
    border-radius: 50%;
    text-align: center;
    font-size: 40px;
    color: #fff;
    background: rgba(0,0,0,.35);
    cursor: pointer;
    z-index: 9999;
    display: none;
}

.dtLeft {
    left: 10px;
}

.dtRight {
    right: 10px;
}