.cbp-container{
    text-align:center;
}

#cbp-grid{
    display:grid;
    grid-template-columns: repeat(9,1fr);
    max-width:320px;
    margin:auto;
    gap:4px;
}

.cbp-cell{
    width:100%;
    aspect-ratio:1/1;
    text-align:center;
    font-size:18px;
}

.cbp-block{
    background:#222;
}

.cbp-correct{
    background:#4CAF50;
    color:#fff;
}

.cbp-wrong{
    background:#f44336;
    color:#fff;
}