body{
    font-family:Arial;
    text-align:center;
    background:#f5f5f5;
}

#board{
    width:420px;
    margin:auto;
    display:grid;
    grid-template-columns:repeat(6,70px);
    grid-template-rows:repeat(6,70px);
}

.cell{
    width:70px;
    height:70px;
    border:1px solid #555;
    display:flex;
    justify-content:center;
    align-items:center;
    font-size:24px;
    cursor:pointer;
    user-select:none;
}

.white{
    background:#F0D9B5;
}

.black{
    background:#B58863;
}

.visited{
    background:#4CAF50 !important;
    color:white;
    font-weight:bold;
}

.current{
    background:#2196F3 !important;
    color:white;
}