body, ul {
    margin: 0;
    padding: 0
}

ul {
    list-style: none
}

p {
    margin-top: 40px
}

.roll-wrap:hover .control {
    display: block
}

.roll-wrap {
    position: relative;
    width: 100%;
    height: 140px;
    overflow: hidden
}

    .roll-wrap .roll__list {
    }

.roll_row .roll__list::before, .roll_row .roll__list::after {
    content: "";
    display: table;
    line-height: 0
}

.roll_row .roll__list::after {
    clear: both
}

.roll_row .roll__list {
    width: 9999px;
    height: 140px;
}

    .roll_row .roll__list li {
        float: left;
        display: block;
        margin-right: 20px;
        width: 176px;
        height: 140px;
        line-height: 140px;
        text-align: center;
        color: #fff;
        background-color: #fff;
    }
    .roll_row .roll__list li img {
        width: 176px;
        height: 140px;
    }

.control {
    position: absolute;
    top: 70px;
    display: none;
    padding: 10px 5px;
    font-weight: 700;
    text-decoration: none;
    color: #fff;
    background-color: rgba(0,0,0,.3)
}

    .control:hover {
        background-color: rgba(0,0,0,.5)
    }

    .control.pre {
        left: 5px;
        text-decoration: none;
    }

    .control.next {
        right: 5px;
        text-decoration: none;
    }

.roll_col {
    width: 100%;
    height: 200px;
    overflow: hidden
}

    .roll_col .roll__list {
        width: 100%
    }

.h600 {
    height: 600px
}

.roll_col li {
    display: block;
    height: 200px;
    line-height: 200px;
    font-size: 30px;
    font-weight: 700;
    text-align: center;
    color: #fff;
    background-color: #f90
}

.roll_col .li-2 {
    background-color: #09f
}

.roll_col .li-3 {
    background-color: #f09
}

.roll_col .li-4 {
    background-color: #0f9
}

.roll_col .control {
    top: 80px
}