html {
    font-family:Arial, Helvetica, sans-serif;
    background-color: black;
    color: white;
}
.square {
    width: 200px;
    height: 200px;
    border-style: solid;
    border-color: white;
}

.grid {
    display: flex;
    flex-flow: row wrap;
    justify-content: center;
    align-content: center;
    width: 618px;
    height: 618px;
}

.mole {
    background-image: url("mole.png");
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}