.prev-container{
position: absolute;
z-index: 9;
margin: -147.2px 0px;
width: 43px;
height: 43px;
font: bold 10px/35px arial, helvetica, sans-aerif;
text-align: center;
background-image: url(http://bhfazcultura.pbh.gov.br/sites/bhfazcultura.pbh.gov.br/files/Slideshow/prev.png);
background-repeat: no-repeat;
background-position: center center;
opacity:0.6;
filter:alpha(opacity=60);
}