.menu {
    background-color: grey;
    left: 50%;
    top: 40%;
    position: absolute;
    text-align: center;
    display: none;
    z-index: 3;
}

.BlackBox {
    background-color: black;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    position: absolute;
    display: block;
    z-index: 2;
    opacity: 0;
}

.restart {
    background-color: grey;
    left: 50%;
    top: 40%;
    position: absolute;
    text-align: center;
    display: none;
    z-index: 3;
}