.friend {
    overflow: hidden;
    margin: 0 auto;
}

.mr_frbox {
    padding: 24px 0 0;
}

.mr_frBtnL {
    float: left;
    display: inline;
    margin:100px 10px 0 0;
    width: 28px;
    height: 46px;
    cursor: pointer
}

.mr_frUl {
    float: left;
    width: 1000px;
    margin: 0 auto;
}

.mr_frBtnR {
    float: right;
    margin-top: 100px;
    width: 28px;
    height: 46px;
    cursor: pointer
}

.mr_frUl ul li {
    position: relative;
    float: left;
    display: inline;
    overflow: hidden;
    width: 310px;
    height: 220px;
    padding: 10px 12px;
}

.mr_frUl ul li img {
    width: 310px;
    height: 220px;
}