html, body
{
    height: 100%;
}

#blanket
{
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: #FFF;
    opacity: 0.6;
    display: none;
}

.modal
{
    position: fixed;
    top: 200px;
    left: 50%;
    margin-left: -201px;
    width: 400px;
    background-color: #FFF;
    box-shadow: 0 5px 10px #999;
    text-align: center;
    border: solid 1px #000;
    padding: 10px;
}