*{
    margin: 100;
    padding: 100;
    background-color: yellowgreen;
}

.chessboard{
    width: 640px;
    height: 640px;
    margin: 20px;
    border: 20px solid green;
    left: 22.5%;
    position: absolute;
}

.black{
    width: 80px;
    height: 80px;
    float: left;
    background-color: lightgreen;
    font-size: 50px;
    text-align: center;
    vertical-align: middle;
}

.white{
    width: 80px;
    height: 80px;
    float: left;
    background-color: lightcyan;
    font-size: 50px;
    text-align: center;
    vertical-align: middle;
}