#blah {
    max-height: 170px;
    height: auto;
    width: auto;
    display: block;
    margin-left: auto;
    margin-right: auto;
    padding: 5px;
    max-width: 735px;
}

#img_contain {
    border-radius: 5px;
    /*border:1px solid grey;*/
    margin-top: 20px;
    width: auto;
}