Nested DIV Circles (Animated)

Nested circles, animated with CSS to make a tunneling effect.

by MegaScience

HTML

<div id="container">
    <div>
        <div>
            <div>
                <div>
                    <div>
                        <div>
                            <div>
                                <div>
                                    <div>
                                        <div>
                                            <div>
                                                <div>
                                                    <div>
                                                        <div>
                                                            <div>
                                                                <div>
                                                                    <div>
                                                                        <div>
                                                                            <div>
                                                                                <div>
                                                                                    <div>
                                                                                        <div>
                                                                                            <div>
                                                                                                <div>
                                                                                                    <div>
                                                                                                        <div>
                                                                                                            <div>
                                                                                                                <div>
                                                                                                                    <div></div>
                                                        ...

CSS

@keyframes myOrbit {
    from {
        transform: rotate(0deg) translateX(10px) rotate(0deg);
    }
    to {
        transform: rotate(360deg) translateX(10px) rotate(-360deg);
    }
}
html, body {
    height: 100%;
    margin: 0;
    overflow: hidden;
}
#container {
    overflow: hidden;
}
#container div {
    height: 100%;
    width: 100%;
    padding: 5%;
    border-radius: 100%;
    border: 2px solid rgba(0, 0, 0, 0.3);
    box-sizing: border-box;
    background-color: rgba(0, 0, 255, 0.3);
    /**/
    animation: myOrbit 4s linear infinite;
}
#container div:empty {
    background-color: rgba(255, 0, 0, 0.3);
}
#container > div {
    height: 100vmin;
    width: 100vmin;
    overflow: hidden;
    margin: 0 auto;
}
#container {
    width: 100%;
    height: 100%;
}