Circles infinite rotation

HTML

<div class="major">
    <div class="minor"></div>
</div>

CSS

.major {
  border-bottom:5px solid #444;
  border-top:5px solid red;
    background-color: #0f0;
    width: 100px;
    height: 100px;
    border-radius: 50px;
    position: relative;
    -webkit-animation: rotating 1s linear infinite;
    transform:rotateY(160deg);
}
.minor {
    background-color: #0ff;
    width: 50px;
    height: 50px;
    border-radius: 25px;
    position: absolute;
    top: 0;
    left: 25px;
}
@-webkit-keyframes rotating {
    from {
        -webkit-transform: rotate(0deg);
    }
    to {
        -webkit-transform: rotate(360deg);
    }
}