#slider {
    position: relative;
    overflow: hidden;
    /*margin: 0 auto;*/
    border-radius: 6px;
}

    #slider ul {
        position: relative;
        margin: 0;
        padding: 0;
        height: 390px;
        list-style: none;
    }

        #slider ul li {
            position: relative;
            display: block;
            float: left;
            margin: 0;
            padding: 0;
            width: 100%;
            height: 390px;
            background: #818181;
            text-align: center;
            /*line-height: 300px;*/
        }

a.control_prev, a.control_next {
    position: absolute;
    top: 40%;
    z-index: 999;
    display: block;
    padding: 4% 3%;
    width: auto;
    height: auto;
    background: #2a2a2a;
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    opacity: 0.5;
    cursor: pointer;
}

    a.control_prev:hover, a.control_next:hover {
        opacity: 1;
        -webkit-transition: all 0.5s ease;
    }

a.control_prev {
    border-radius: 0 2px 2px 0;
}

a.control_next {
    right: 0;
    border-radius: 2px 0 0 2px;
}