#cf {
position: relative;
height: 600px;
width: 800px;
margin: 0 auto;
color: #fff;
}
#cf img {
position: absolute;
left: 0;
width: 400px; height:300px;
border: 2px solid white;
border-radius: 10px;
transition: opacity 1s ease-in-out;
}
#cf img.top: hover {
opacity: 0;
}
<div id="cf">
<img class="bottom" src="images/f1.jpg"/>
<img class="top" src="images/f2.jpg"/>
</div>
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