@CHARSET "UTF-8";
.outer{
    position: relative;
    margin:20px auto;
    width: 292px;
    height: 36px;
    line-height: 36px;
    border:1px solid #ccc;
    background: #ccc9c9;
    font-size: 15px;
}
.outer span,.filter-box,.inner{
    position: absolute;
    top: 0;
    left: 0;
}
.outer span{
    display: block;
    width: 100%;
    height: 100%;
    color: #fff;
    text-align: center;
}
.filter-box{
    width: 0;
    height: 100%;
    background: green;
    z-index: 9;
}
.outer.act span{
    padding:0 36px 0 0;
}
.inner{
    width: 36px;
    height: 36px;
    text-align: center;
    background: #fff;
    cursor: pointer;
    font-family: "宋体";
    z-index: 10;
    font-weight: bold;
    color: #929292;
}
.outer.act .inner{
    color: green;
}
.outer.act span{
    z-index: 99;
}