#content_wrapper {
    width: 1200px;
    height: auto;
    margin-left: auto;
    margin-right: auto;
    margin-top: 20px;
}
    .content_row {
        width: 1200px; 
        height: 410px;
    }
        .content_row_item {
            width: 380px;
            height: 410px;
            float:left;
            text-align: center;
        }
            .content_row_item img{
                width: 350px;
                height: 350px;
            }
        .dl_buttons {
            margin-top: 10px;
            text-align:center;
        }
            .dl_buttons img {
                width: 110px;
                height: 40px;
            }