Animation CSS3: display + opacity

Question

I have got a problem with a CSS3 animation.

.child {
    opacity: 0;
    display: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transit         


        

Answer 1

HOW TO ANIMATE OPACITY WITH CSS:
this is my code:
the CSS code

.item {   
    height:200px;
    width:200px;
    background:red;
    opacity:0;
    transition: opacity 1s ease-in-out;
}

.item:hover {
    opacity: 1;
}
code {
    background: linear-gradient(to right,#fce4ed,#ffe8cc);
}

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