#voice-visualizer {
    display: none;
    height: 30px;
    width: 100px;
    margin: 10px auto;
    justify-content: space-between;
    align-items: flex-end;
}

    #voice-visualizer div {
        width: 10px;
        height: 10px;
        background-color: #4caf50;
        animation: bounce 1s infinite ease-in-out;
    }

        #voice-visualizer div:nth-child(2) {
            animation-delay: 0.1s;
        }

        #voice-visualizer div:nth-child(3) {
            animation-delay: 0.2s;
        }

        #voice-visualizer div:nth-child(4) {
            animation-delay: 0.3s;
        }

        #voice-visualizer div:nth-child(5) {
            animation-delay: 0.4s;
        }

@keyframes bounce {
    0%, 100% {
        height: 10px;
    }

    50% {
        height: 30px;
    }
}