.clearfix:after {
        content: ".";
        display: block;
        height: 0;
        clear: both;
        visibility: hidden
    }

    .clearfix {
        *+height: 1%;
    }

    .sliderroll {
        height: 300px;
        margin:30px auto;
    }

    .sliderroll ul {}

    .sliderroll ul li {
        border:1px solid #fff;
    }

    .sliderroll ul li img {}

    .left,
    .right {
        cursor: pointer;
    }