.foo
{
}

@media screen
{
    div[id="Portfolio"] div.items > ul > li
    {
        border: 1px solid #aaa;
        position: relative;
    }
    
    div[id="Portfolio"] div.items > ul > li > div.description
    {
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        background: #000;
    }
    
    
}