#div_con, #div_msg, #div_con2 {
    margin: 0;
    padding: 0;
}

#div_con {
    position: relative;
    width: 100%;
    height: 550px;
    border: 2px solid #eee;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden;

}


#div_con2 {
    margin-top: 15px;
    width: 100%;
    height: 520px;
    position: relative;
    overflow: hidden;
}

#div_msg {
    position: absolute;
    width: 100%;
    height: auto;
    overflow: hidden;
}