perAlbi<3

<!DOCTYPE html>
<html>
    <head>
        <title>Result</title>
        <link rel='stylesheet' type='text/css' href='stylesheet.css'/>
        <script type='text/javascript' src='script.js'></script>
    </head>

    <body>
    <div id='prova'></div>
    </body>
</html>

<!-- CSS

#prova {
    border-radius: 5px;
    border: 1px solid #000;
    height: 100px;
    width: 100px;
    background: black;
    display: none;
}
-->

<!-- Script jQuery
$(document).ready(function() {
    $('#prova').fadeIn(3000);
});
-->