body {
    background: #020617;
    color: #fff;
    text-align: center;
}

#grid {
    display: grid;
    grid-template-columns: repeat(4, 80px);
    gap: 10px;
    justify-content: center;
}

.cell {
    width: 80px;
    height: 80px;
    background: #334155;
    cursor: pointer;
}
.active {
    background: #22d3ee;
}