h2, p {
    text-align: center;
}

.buttons {
    text-align: center;
    margin: 20px 0;
}

.gomoku {
    margin: 20px auto;
    width: 450px;
}

.gomoku .board-row {
    height: 30px;
}

.gomoku .board-row .board-field {
    float: left;
    width: 30px;
    height: 30px;
    border: 1px solid #888;
    background-color: #f6e092;
}

.gomoku .board-row .board-field span {
    margin-top: 2px;
    margin-left: 2px;
    display: block;
    width: 24px;
    height: 24px;
    border-radius: 24px;
    text-align: center;
    line-height: 24px;
}

.gomoku .board-row .board-field.empty:hover {
    opacity: 0.5;
}

.gomoku .board-row .board-field.empty span {
    display: none;
}

.gomoku .board-row .board-field.black span {
    background-color: #333;
    color: #333;
}

.gomoku .board-row .board-field.white span {
    background-color: #fff;
    color: #fff;
}

.gomoku.show-numbers .board-row .board-field.black span {
    color: #fff;
}

.gomoku.show-numbers .board-row .board-field.white span {
    color: #333;
}