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dabblet.css

body {
    background-color: #fff;
    color: #333;
}

.box {
    position: absolute;
    margin: 10px;
    width: 150px;
    height: 150px;
    opacity: 0.9;
}

.red {
    background-color: red;
    left: 0;
    top: 0;
}

.green {
    background-color: green;
    right: 0;
    top: 0;
}

.blue {
    background-color: blue;
    left: 0;
    bottom: 0;
}

.yellow {
    background-color: yellow;
    right: 0;
    bottom: 0;
}

dabblet.html

<div class="box red"></div>
<div class="box green"></div>
<div class="box blue"></div>
<div class="box yellow"></div>

settings.json

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