#content {
    display: grid;
    grid-template-columns: 50px 50px 50px 50px 50px 50px 50px 50px;
    gap: 5px;
}

.cell {
    width: 50px;
    height: 50px;
    border: 1px solid black;
    background: white;
}

.cell.active {
    background: black;
}

.cell.active.highlight {
    background-color: #02ff0a; /* Highlighted column color */
}

.cell.highlight {
    background-color: #b4ffb6;
    border-color: #02ff0a; /* Highlighted column color */
}