#Popup
{
    text-align: center;
    width: 200px;
    height: 100px;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid black;
    position: relative;
    background-color: white;
    top: 50%;
}
#bodyCss
{
    background-color: #00000044;
    background-blend-mode: darken;
}
html, body
{
    height: 100%;
    margin: 0;
}
*
{
    box-sizing: border-box;
}