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div.preloader { position: absolute; z-index: 1100; top: 50%; left: 50%; }
div.preloader span { display: block; width: 100px; border: solid 1px #ccc; text-align: center; }
div.preloaderbg { position: absolute; z-index: 1000; top: 0px; left: 0px; width: 100%; height: 100%; background: #000; }