.sbmoreview 
{
    opacity:0;
    position: absolute;
    transition: all 4s ease;
    -webkit-transition:all 4s ease;
    -moz-transition:all 4s ease;
    -o-transition:all 4s ease;
}
.product-image:hover .sbmoreview
{
    opacity:1;
}
.product-image:hover .sbview
{
    opacity:0;
}