css3 波动效果

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        body{
            background: #000;
        }
    </style>
</head>
<body>
<style>


    @keyframes load-ico-key
    {
        0% {
            transform:scale(0.5) ;
            opacity: 0.5;
        }
        100% {
            transform:scale(1) ;
            opacity: 0;
        }
    }

    .ani-box{
        width: 150px;
        height: 150px;
        position: relative;
    }
    .ani-box .circle{
        animation: load-ico-key 2.5s;
        animation-iteration-count: infinite;
        width: 100%;
        height: 100%;
        background: #fff;
        left: 0;
        top: 0;
        position: absolute;
        border-radius: 100%;
        transform:scale(0.5);
        opacity: 0.5;
    }

    .ani-box .circle:nth-child(1){
        animation-delay:0s;
    }
    .ani-box .circle:nth-child(2){
        animation-delay:0.5s;
    }
    .ani-box .circle:nth-child(3){
        animation-delay:1s;
    }
    .ani-box .circle:nth-child(4){
        animation-delay:1.5s;
    }
    .ani-box .circle:nth-child(5){
        animation-delay:2s;
    }


</style>
<div class="ani-box">
    <div class="circle"></div>
    <div class="circle"></div>
    <div class="circle"></div>
    <div class="circle"></div>
    <div class="circle"></div>
</div>


</body>
</html>
css3 波动效果

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