* {
    margin: 0;
    padding: 0;
    text-align: center;
}
button {
    margin: 5px;
    padding: 10px;
}

#board {
    position: absolute;
    left: calc(50% - 375px);
    z-index: 0;
}

#menu {
    position: absolute;
    left: calc(50% - 225px);
    top: 600px;
    width: 600px;
    text-align: left;
}

#debug div {
    text-align: left;
}

.l_back {
    position: absolute;
    width: 100px;
    height: 80px;
    cursor: pointer;
    margin-right: 30px;
    border-radius: 50px;
    z-index: 1;
}

.l_field {
    position: absolute;
    width: 100px;
    height: 80px;
    cursor: pointer;
    margin-right: 30px;
    border-radius: 50px;
    font-size: 80px;
    color: black;
    padding-top: 25px;
    z-index: 10;
}

.l_black {
    position: absolute;
    width: 100px;
    height: 80px;
    cursor: pointer;
    margin-right: 30px;
    border-radius: 50px;
    font-size: 40px;
    color: blue;
    z-index: 20;
}

.l_white {
    position: absolute;
    width: 100px;
    height: 80px;
    cursor: pointer;
    margin-right: 30px;
    border-radius: 50px;
    font-size: 40px;
    color: red;
    z-index: 30;
}