.outer-box{
    position: relative;
    height: 100%;
    width: 100%;
    header{
        position: fixed;
        left: 0;
        right: 0;
        top: 0;
        z-index: 7;
        width: 100%;
        padding: 0 20px;
        background: #242A33;
        color: #999;
        height: 50px;
        line-height: 40px;
    }
}