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css-animation
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圆环.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    body{
        margin: 0;
        padding: 0;
    }
    .loader{
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        width: 200px;
        height: 200px;
        /* background: #000; */
        box-sizing: border-box;
        border-radius: 50%;
    }
    .loader:before{
        content: "";
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        width: 0;
        height: 0;
         box-sizing: border-box;
        border-radius: 50%;
        animation: animate 2s linear infinite;
    }
    .loader:after{
        content: "";
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        width: 0;
        height: 0;
        box-sizing: border-box;
        border-radius: 50%;
        animation: animate 2s linear infinite;
        animation-delay: 1s;
    }
@keyframes animate {
    0%{
        width: 0;
        height: 0;
        border: 4px solid #000;
        opacity: 1;
        box-shadow: 0 0 10 #000;
    }
    70%{
        opacity: 1;
    }
    100%{
        width: 100%;
        height: 100%;
        border: 4px solid #000;
        opacity: 0;
        box-shadow: 0 0 10 #000;
    }
}
</style>
<body>
    <div class="loader">


    </div>
</body>
</html>