CSS Transition on Hover

Question

I have a problem. I actually try to do a transition at a div when I hover the mouse over an object. So basically I have a div, and when I hover my mouse the div, it should displ

Answer 1

#on-hover {
    opacity: 0;
    transition: opacity 0.5s;
    -webkit-transition: opacity 0.5s;
}
#first:hover #on-hover {
    opacity: 1;
}

This is only about the animation. A more detailed example here: http://jsfiddle.net/ELa6X/