body {
    font-family: 'Segoe UI', sans-serif;
    display: block;
    background-color: grey;
    margin: 0;
    /*height:100%;
    overflow-y:scroll;
    -webkit-overflow-scrolling:touch;*/
}

.divad {
    border: 1px solid black;
    z-index: 2;
    padding: 0;
    margin: 0;
    background-color: white;
    position: absolute;
    left: 50%;
}

.divgame {
    z-index: 1;
    position: relative;

    display: flex;
    align-items: center;
    flex-direction: column;
    justify-content: center;
}

.height100{
    height:100%; 
}