.board-wrapper {
    position: relative;
    display: inline-block;
    padding: 8px;
    border-radius: 18px;
    background: rgba(15,23,42,.86);
    border: 1px solid rgba(71,85,105,.55);
    box-shadow: 0 20px 45px rgba(0,0,0,.42);
    touch-action: none;
}

.grid-container {
    position: relative;
    display: grid;
    z-index: 10;
}

.board-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #e2e8f0;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
    z-index: 10;
    border-radius: 4px;
    pointer-events: none;
}

#selection-canvas {
    position: absolute;
    pointer-events: none;
    z-index: 5;
}