Untitled

dabblet.css

.wrapper {
    background: url('http://daix.me/demo/img/reese.jpg') no-repeat fixed;
    width: 900px;
    height: 600px;
}
.lens {
    position: relative;
    width: 100px;
    height: 100px;
    top: 10%;
    left: 50%;
    cursor: move;
    z-index: 1;
}
.lens:after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;

    border-radius: 100px;
    -webkit-box-shadow: 0 0 5px rgba(0,0,0,.2);
    -moz-box-shadow: 0 0 5px rgba(0,0,0,.2);
    box-shadow: 0 0 5px rgba(0,0,0,.2);
    background: url('http://daix.me/demo/img/reese.jpg') no-repeat fixed;
    -webkit-transform: scale(1.2);
    -moz-transform: scale(1.2);
    transform: scale(1.2);
    z-index: -1;
}

dabblet.html

<div class="wrapper">
  <div class="lens">
  </div>
</div>

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"all"}