.block_7 .topGongzai-1,
    .block_7 .topgongzai-1 {
        position: absolute;
        background: url(img/dogs.png) no-repeat;
        background-position: 100% 100%;
        background-size: cover;
        z-index: 999;
        width:140px;
        height:80px;
        bottom:-20px;
        left:250px;
    }