Found this online.
It utilizes the transform-style: preserve-3d
property and rotates the electrons on the x, y and z axis to achieve this 3D effect.
HTML Structure
<div id="main">
<div id="atom">
<div class="orbit">
<div class="path">
<div class="electron"></div>
</div>
</div>
<div class="orbit">
<div class="path">
<div class="electron"></div>
</div>
</div>
<div class="orbit">
<div class="path">
<div class="electron"></div>
</div>
</div>
<div class="orbit">
<div class="path">
<div class="electron"></div>
</div>
</div>
<div id="nucleus"></div>
</div>
</div>
CSS
.orbit {
-webkit-transform-style: preserve-3d;
-webkit-transform: rotateX(80deg) rotateY(20deg);
}
#atom .orbit:nth-child(2) {
-webkit-transform: rotateX(80deg) rotateY(70deg)
}
#atom .orbit:nth-child(3) {
-webkit-transform: rotateX(80deg) rotateY(-20deg)
}
#atom .orbit:nth-child(4) {
-webkit-transform: rotateX(80deg) rotateY(-50deg)
}
.path {
-webkit-transform-style: preserve-3d;
-webkit-animation-name: pathRotate;
-webkit-animation-duration: 2s;
-webkit-animation-iteration-count: infinite;
-webkit-animation-timing-function: linear;
}
.electron {
-webkit-animation-name: electronFix;
-webkit-animation-duration: 2s;
-webkit-animation-iteration-count: infinite;
-webkit-animation-timing-function: linear;
}
@-webkit-keyframes pathRotate {
from {
-webkit-transform: rotateZ(0deg);
} to {
-webkit-transform: rotateZ(360deg);
}
}
@-webkit-keyframes electronFix {
from {
-webkit-transform: rotateX(90deg) rotateY(0deg);
} to {
-webkit-transform: rotateX(90deg) rotateY(-360deg);
}
}
Fiddle
Blog Post