#fotos {
    background:     #D7D7D7 url(../images/index/portal_gross.jpg) top center no-repeat;
    width:          750px;
    height:         332px;
    height:         592px;
    border-top:     1px solid #FFFFFF;
    border-bottom:  1px solid #FFFFFF;
    display:        block;
    float:          none;
}

#fotos div img { margin-bottom:1px; }