css3 音乐播放的音浪效果

<div class="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{
            width: 40px;
            height: 30px;
            position: absolute;
            left: 50%;
            top: 60%;
            margin: -30px 0 0 -20px;
        }
        .bar{
            background: #795548;
            height: 3px;
            width: 3px;
            position: absolute;
            bottom: 1px;
            animation: voice 0ms -800ms linear infinite alternate;
        }
        @keyframes voice{
                
            0%{
                height: 3px;
                opacity: .35;
            }
            100%{
                height: 24px;
                opacity: 1;
            }
        }
        .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; }