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<div id="bars">
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"></div>
</div>

#bars {
        height: 30px;
        left: 50%;
        margin: -30px 0 0 -20px;
        position: absolute;
        top: 50%;
        width: 40px;
    }

    .bar {
        background: #E20074;
        bottom: 1px;
        height: 3px;
        position: absolute;
        width: 3px;
        animation: sound 0ms -800ms linear infinite alternate;
    }

    @keyframes sound {
        0% {
            opacity: .35;
            height: 3px;
        }
        100% {
            opacity: 1;
            height: 28px;
        }
    }

    .bar:nth-child(1) {
        left: 1px;
        animation-duration: 474ms;
    }

    .bar:nth-child(2) {
        left: 5px;
        animation-duration: 433ms;
    }

    .bar:nth-child(3) {
        left: 9px;
        animation-duration: 407ms;
    }

    .bar:nth-child(4) {
        left: 13px;
        animation-duration: 458ms;
    }

    .bar:nth-child(5) {
        left: 17px;
        animation-duration: 400ms;
    }

    .bar:nth-child(6) {
        left: 21px;
        animation-duration: 427ms;
    }

    .bar:nth-child(7) {
        left: 25px;
        animation-duration: 441ms;
    }

    .bar:nth-child(8) {
        left: 29px;
        animation-duration: 419ms;
    }

    .bar:nth-child(9) {
        left: 33px;
        animation-duration: 487ms;
    }

    .bar:nth-child(10) {
        left: 37px;
        animation-duration: 442ms;
    }