#cf2 {
position:relative;
width:100%;
margin:0 auto;
}

#cf2 img {
position:absolute;
left:0;
width:100%;
-webkit-transition: opacity 3s ease-in-out;
-moz-transition: opacity 3s ease-in-out;
-o-transition: opacity 3s ease-in-out;
transition: opacity 3s ease-in-out;
}
  
#cf2 img.transparent {
opacity:0;
}