.dialog_root::before {
    content:'';
    vertical-align:middle;
    display:inline-block;
    height:100%;
}

.dialog_root {
    background-color:rgba(0, 0, 0, 0.42);
    position:fixed;
    left:0px;
    right:0px;
    top:0px;
    bottom:0px;
    z-index:4;
    text-align:center;
    overflow:auto;
}

.dialog_content
{
    background-color:lightgray;
    font-size: smaller;
    z-index:5;
    max-width:360px;
    display:inline-block;
    vertical-align:middle;
    box-shadow: 0px 0px 12px 1px #000000;
}