.header_box {
    z-index: 200;
    width: 100%;
    text-align: center;
}
.p_relative{
    position:relative;
}

.img_common {
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.img_share {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 149px;
    height: 90px;
    background-image: url(../community/fenxiang.png);
}