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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>超炫Loading动画</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="main">
        <div class="container">
            <div class="circle">
                <span style="--i:0;"></span>
                <span style="--i:1;"></span>
                <span style="--i:2;"></span>
                <span style="--i:3;"></span>
                <span style="--i:4;"></span>
                <span style="--i:5;"></span>
                <span style="--i:6;"></span>
                <span style="--i:7;"></span>
                <span style="--i:8;"></span>
                <span style="--i:9;"></span>
                <span style="--i:10;"></span>
                <span style="--i:11;"></span>
                <span style="--i:12;"></span>
                <span style="--i:13;"></span>
                <span style="--i:14;"></span>
                <span style="--i:15;"></span>
                <span style="--i:16;"></span>
                <span style="--i:17;"></span>
                <span style="--i:18;"></span>
                <span style="--i:19;"></span>
                <span style="--i:20;"></span>
            </div>

            <div class="circle">
                <span style="--i:0;"></span>
                <span style="--i:1;"></span>
                <span style="--i:2;"></span>
                <span style="--i:3;"></span>
                <span style="--i:4;"></span>
                <span style="--i:5;"></span>
                <span style="--i:6;"></span>
                <span style="--i:7;"></span>
                <span style="--i:8;"></span>
                <span style="--i:9;"></span>
                <span style="--i:10;"></span>
                <span style="--i:11;"></span>
                <span style="--i:12;"></span>
                <span style="--i:13;"></span>
                <span style="--i:14;"></span>
                <span style="--i:15;"></span>
                <span style="--i:16;"></span>
                <span style="--i:17;"></span>
                <span style="--i:18;"></span>
                <span style="--i:19;"></span>
                <span style="--i:20;"></span>
            </div>
        </div>
    </div>
</body>
</html>
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 背景 */
.main{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: cadetblue;
    animation: animateColor 8s linear infinite;
}
/* 背景色变化 */
@keyframes animateColor {
    0%{
        filter: hue-rotate(0deg);
    }
    100%{
        filter: hue-rotate(360deg);
    }
}

/* 内容宽 */
.main .container{
    display: flex;
}
/* 盒子-圆 */
.main .container .circle{
    position: relative;
    width: 150px;
    height: 150px;

    margin:  0 -8px;
}
/* 盒子-点 */
.main .container .circle span{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;

    /* 通过旋转将 点 画一个圆 */
    transform: rotate( calc( 360deg / ( 21 - 1 ) * var(--i) ));
}

/* 每一个点 */
.main .container .circle span::before{
    content: '';
    position: absolute;
    
    right: 0;
    top: calc( 50% - 7.5px );

    width: 15px;
    height: 15px;
    background-color: antiquewhite;
    border-radius: 50%;

    /* 发光效果 */
    box-shadow: 0 0 10px antiquewhite,
    0 0 20px antiquewhite,
    0 0 40px antiquewhite,
    0 0 60px antiquewhite,
    0 0 80px antiquewhite,
    0 0 100px antiquewhite;

    /* 通过 大小变化 体现加载 */
    transform: scale(0.1);

    /* 动画设置 */
    animation: animate calc( ( 0.1s * ( 21 - 1 ) ) * 2 ) linear infinite;
    animation-delay: calc( 0.1s * var(--i) );
}
@keyframes animate {
    0%{
        transform: scale(1);
    }
    50%,100%{
        transform: scale(0.1);
    }
}


/* 设置第二个的延迟 和 初始位置 */
.main .container .circle:nth-child(2){
    transform: rotate(-180deg);
}
.main .container .circle:nth-child(2) span::before{
    animation-delay: calc( -0.1s * var(--i) );
}