body {
    margin: 0;
    background: black;
}

/* overlay */
.intro {
    position: fixed;
    inset: 0;
    z-index: 9999;
}

/* grid */
.grid {
    position: absolute;
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: repeat(20, 1fr);
    grid-template-rows: repeat(12, 1fr);
}

.cell {
    border: 1px solid rgba(0,255,255,0.08);
    background: rgba(0,0,0,0.95);
    transition: all 0.4s ease;

    box-shadow: inset 0 0 10px rgba(0,255,255,0.05);
}

.cell.active {
    background: transparent;
    opacity: 0;
    transform: scale(0.8);

    box-shadow: 0 0 20px cyan;
}
/* optional glow pas scan */
.cell.active {
    box-shadow: 0 0 15px cyan;
}