.signal-bar {
    width: 6px;
    height: 12px;
    background-color: transparent;
    border: 1.5px solid #333;
    border-radius: 3px;
    transition: background-color 0.3s ease;
}

.signal-bar-active {
    background-color: #555;
}

#signal {
    display:flex;
    gap:2px;
}