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/* Size the divs */
div { width: 50px; height: 50px; }
/* Colors */
div.green { background: lightgreen; }
div.blue { background: lightblue; }
span.yellow { background: yellow; }
/* Positioning */
.abs { position: absolute; }
.rel { position: relative; }
.in { display: inline-block; }
.pos { top: 0px; left: 0px; }