body{
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    background: url("./images/mario-bg.jpg");
    background-size: cover;
}

#board{
    width: 540px;
    height: 540px;
    /* background-color: green; */
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    background: url("./images/soil.png");
    background-size: cover;
    border: 3px solid white;
    border-radius: 25px;
}

#board div{
    /* board = 540x540, divide into 3x3 tiles --> 180x180 per div*/
    width: 180px;
    height: 180px;
    background-image: url("./images/pipe.png");
    background-size: cover;
}

#board div img{
    width: 100px;
    height: 100px;

    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}