Animated porthole

dabblet.css

/**
 * Animated porthole
 */
@-webkit-keyframes rotate {
    from {
        -webkit-transform: rotate(0deg);
    }
    to {
        -webkit-transform: rotate(360deg);
    }
}
body {
    background-color: #ececec;
    text-align: center;
    margin-top: 50px;
}
.porthole {
    position: relative;
    width: 250px;
    margin-left: auto;
    margin-right: auto;
}
.porthole:before {
    content:' ';
    position: absolute;
    width: 250px;
    height: 250px;
    left: -19px;
    top: -19px;
    background-color: rgba(0, 0, 255, .5);
    border-radius: 50%;
    box-shadow: 0 0 50px rgba(255, 255, 255, .8);
    background: linear-gradient(135deg, #f5f6f6 0%, #dbdce2 12%, #8e9699 32%, #dddfe3 59%, #b8bac6 75%, #f5f6f6 100%);
    /* W3C */
    -webkit-animation-name: rotate;
    -webkit-animation-duration: 50s;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-timing-function: linear;
}
.porthole:after {
    content:' ';
    left: 0;
    top: 0;
    position: absolute;
    border-radius: 50%;
    width: 210px;
    height: 210px;
    border: 2px solid #d2d4da;
    box-shadow: inset 0 0 35px rgba(0, 0, 0, 0.8);
    background-image: url(http://10up.com/wp-content/uploads/2013/12/BrainUp-Announcement-v6.jpg);
}

dabblet.html

<div class="porthole"></div>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split-vertical","fontsize":"80","seethrough":"","prefixfree":"1","page":"css"}