#light a img{opacity:0.3; -moz-opacity:0.3; filter:alpha(opacity=40);}
#light a:hover img{opacity:1.0; -moz-opacity:1.0; filter:alpha(opacity=100);}
html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    
}

.parent {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    overflow: auto;

}


.block {
    width: 600px;
    height: 250px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -125px 0 0 -300px;
    
    img {
        max-width: 100%;
        height: auto;
        display: block;
        margin: 0 auto;
        border: none;
    }
}
li{margin-bottom: 0.4em};