body {
    text-align: center;
}
#board {
    margin: 0 auto;
    border-style: none;
    width: 400px;
    position: relative;
}
.board-bg {
    border-spacing: 0;
    width: 402px;
    height: 402px;
    z-index: -1;
    border-collapse: inherit;
    margin: 0 auto;
}
#board > svg {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}
.board-bg td {
    width: 46px;
    height: 46px;
    border-style: none;
    background: #30d0c6;
}
.board-bg tr:nth-child(odd) td:nth-child(even),
.board-bg tr:nth-child(even) td:nth-child(odd) {
    background: #7c68fd;
}