#focus {
    width: 1180px;
    height: 280px;
    padding-top: 10px;
    box-sizing: border-box;
    margin: 0 auto;
    position: absolute;
    overflow: hidden;
}

#focus ul {
    width: 1135px;
    margin: auto;
    padding-left: 30px;
}

#focus ul li {
    width: 322px;
    height: 250px;
    box-sizing: border-box;
    float: left;
    overflow: hidden;
    margin: 0 28px;
}

#focus .btn {
    position: absolute;
    width: 1200px;
    height: 10px;
    padding: 5px 10px;
    right: 0;
    bottom: 0;
    text-align: right;
}

#focus .btn span {
    display: inline-block;
    _display: inline;
    _zoom: 1;
    width: 25px;
    height: 10px;
    _font-size: 0;
    margin-left: 5px;
    cursor: pointer;
    background: #fff;
}

#focus .btn span.on {
    background: #fff;
}

#focus .preNext {
    width: 45px;
    height: 100px;
    position: absolute;
    top: 90px;
    background: url(../img/sprite.png) no-repeat 0 0;
    cursor: pointer;
}

#focus .pre {
    left: 0;
}

#focus .next {
    right: 0;
    background-position: right top;
}