.fadeInStyle {
    -webkit-transition: opacity 1s;  transition: opacity 1s;  
    opacity: 0;
}

.fadeInStyle:hover {
    opacity:1;
}

.fadeOutStyle {
    -webkit-transition: opacity 1s;  transition: opacity 1s;  
    opacity: 1;
}

.fadeOutStyle:hover {
    opacity:0;
}