atom animation css

HTML

<div class="atom">
    <div class="electron"></div>
   <div class="electron"></div>
       <div class="electron"></div>

    <div class="electron"></div>

    <div class="electron"></div>

</div>

CSS

* {
    margin: 0;
    padding:0;
}
.atom {
    position: relative;
    width: 200px;
    height: 200px;
    background: -webkit-radial-gradient(center, ellipse cover, #000000 0%, #000000 5%, #ffffff 5%, #ffffff 5%, #ffffff 10%, #ffffff 100%);
    border-radius: 100px;
    padding: 0 10px 10px 0;
}
.electron {
    position: absolute;
    width: 200px;
    height: 200px;
    background: transparent;
    border-radius: 150px;
    border: 5px solid skyblue;
    box-shadow: 0 0 0 5px white inset, 0 0 0 5px white;
    animation: electron1 1s linear infinite;
    transform: rotateY(60deg) rotateX(-60deg) rotate(0);
    line-height: 200px;
    text-align: center;
    font-size: 50px;
    color: black;
}
.electron:before {
    content:"";
    display:block;
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 5px;
    background: black;
    top: -7.5px;
    left: 100px;
}
.electron:nth-of-type(2) {
    transform: rotateY(-60deg) rotateX(-60deg) rotate(0);
    animation: electron2 1s linear infinite;
}
.electron:nth-of-type(3) {
    transform: rotateY(75deg) rotateX(0) rotate(180deg);
    animation: electron3 1s linear infinite;
}
@-webkit-keyframes electron1 {
    from {
        transform: rotateY(60deg) rotateX(-60deg) rotate(0);
    }
    to {
        transform: rotateY(60deg) rotateX(-60deg) rotate(360deg);
    }
}
@-webkit-keyframes electron2 {
    from {
        transform: rotateY(-60deg) rotateX(-60deg) rotate(0);
    }
    to {
        transform: rotateY(-60deg) rotateX(-60deg) rotate(360deg);
    }
}
@-webkit-keyframes electron3 {
    from {
        transform: rotateY(75deg) rotateX(0) rotate(180deg);
    }
    to {
        transform: rotateY(75deg) rotateX(0) rotate(540deg);
    }
}